Putting a 2.2g zinc nail into an excess of HCl produces 0.75 L of H2 under standard conditions of temperature and pressure.
What are the standard pressure and temperature?Standard temperature & pressure, also, sometimes known as STP, refers to the ideal atmospheric conditions above sea level. The conditions are 0 degrees Celsius & 1 atmosphere, respectively.
The balancing equation states that 1 mole of Zn interacts to yield 1 mole of hydrogen.
While operated under standard temperature and pressure, 1 mole of a gas will occupy 22.4 L.
Hence:
22.4 L of Hydrogen gas are produced when 1 mole of Zinc reacts.
Here, mass of Zinc = 2.2 g
Molar mass of Zn = 65 g
Moles of Zinc = mass of Zinc / molar mass
Moles of Zn = 2.2 / 65
Moles of Zn = 0.0335 mol
Zn interacts with 0.0335 mol to produce, 0.0335 *22.4 L of H2.
= 0.75 L of H2
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The complete question is -
Zn + 2HCl → ZnCl2 + H2
At conditions of Standard Temperature and Pressure, determine how many liters of hydrogen gas are produced by placing a zinc nail with a mass of 2.2g into an excess of hydrochloric acid.
A) 0.0015 L B) 0.75 L C) 1.33 L D) 6.42 L
which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? group of answer choices ga. ge
Ca and Sr they belong to same group and have same no of valence electrons and forms similar type of compounds. Hence they must have similar properties.
What do you call molecules that are similar?Additionally, new compounds can be created by atoms joining in exactly the same ways to form bonds.These molecules, which go by the name isomers, merely differ in terms of how their atoms are arranged.
What main classes of compounds are there?Salts and molecular compounds are the two main categories of chemicals.Covalent bonds are the means through which atoms in molecular compounds are joined.It is connected by ionic bonds in salts.All compounds are composed of these two different sorts of bonds.
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what chemical can be used to test for the presence of simple sugar? question 6 options: sudan iv biuret iodine potassium permanganate
What chemical can be used to test for the presence of simple sugars is a solution of Benedict's Solution.
Explanation of Benedict's solutionBenedict's solution is used to test for the presence of reducing sugars in a sample. The principle of the test is the same as the test using Fehling's solution. Benedict is generally used for qualitative analysis of glucose, but can be used for quantitative analysis of glucose by titration. The advantage of Benedict's reagent is that it contains fewer components but is precise and accurate.
Reducing sugars that can be tested are monosaccharides, disaccharides except sucrose. Benedict's solution will test for the presence of aldehyde and ketone groups in aldose and ketose sugars. The reducing sugar test using Benedict's solution is very sensitive so it can detect glucose levels as low as 0.1% in the mixture, so it is very often used for urine and blood samples.
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When the temperature of a rigid hollow sphere containing 750 mL of hydrogen gas is held at 67°C, the pressure of the gas is 950.0 mm Hg. How many grams of hydrogen does the sphere contain?
The mass (in grams) of hydrogen gas present in sphere, given that the gas is held at 67 °C is 0.068 g
How do I determine the mass of the hydrogen gas present?First, we shall determine the mole of the hydrogen gas in the sphere. Details below:
Volume (V) = 750 mL = 750 / 1000 = 0.75 LTemperature (T) = 67 °C = 67 + 273 = 340 KPressure (P) = 950 mmHg = 950 / 760 = 1.25 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?PV = nRT
Divide both sides by RT
n = PV / RT
n = (1.25 × 0.75) / (0.0821 × 340)
n = 0.034 moles
Finally, we shall determine the mass of the hydrogen gas present in the sphere. This can be obtained as follow:
Mole of hydrogen gas = 0.034 moles Molar mass of hydrogen gas = 1 × 2 = 2 g/molMass of hydrogen gas =?Mole = mass / molar mass
Cross multiply
Mass = Mole × molar mass
Mass of hydrogen gas = 0.034 × 2
Mass of hydrogen gas = 0.068 g
Thus, the mass of the hydrogen gas is 0.068 g
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classify the following processes as endothermic or exothermic. a) when whipped cream is forced out of the can, it is propelled by dinitrogen monoxide gas, n2o. after expelling the whipped cream, the can feels cold. if the can is the surroundings, was the process endothermic or exothermic? b) when water is placed into a freezer, it forms ice cubes. if the water is the system, was the process endothermic or exothermic? c) ice melt, calcium chloride, cacl2, is used in the winter to melt ice on sidewalks and driveways. if the calcium chloride is the system and the ice is the surroundings, was the process endothermic or exothermic?
The endothermic or exothermic processes include:
a) Exothermic
b) Endothermic
c) Exothermic
What are endothermic and exothermic processes?Endothermic and exothermic processes are terms used to describe the transfer of energy between a system and its surroundings.
In an endothermic process, energy is absorbed by the system from its surroundings, typically in the form of heat. This results in an increase in the system's internal energy and a decrease in the temperature of the surroundings.
On the other hand, in an exothermic process, energy is released by the system to its surroundings, usually as heat. This results in a decrease in the system's internal energy and an increase in the temperature of the surroundings.
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the half-life of a certain radioactive substance is 24 hours. there are 9 grams present initially. a. express the amount of substance remaining as a function of time t. b. when will there be 1 gram remaining?
So after approximately 165.7 hours, there will be 1 gram of the radioactive substance remaining.
A. The amount of the radioactive substance remaining after time t is given by
9 * (1/2)^(t/24),
where t is in hours.
B. To find when 1 gram will remain, we need to solve 9 * (1/2)^(t/24) = 1 for t.
Taking the natural logarithm of both sides gives: log(9 * (1/2)^(t/24)) = log(1).
Dividing both sides by log(1/2) and rearranging, we find: t = 24 * log(9) /
log(1/2) = approximately 165.7 hours.
So after approximately 165.7 hours, there will be 1 gram of the radioactive substance remaining.
the half-life of a certain radioactive substance is 24 hours. there are 9 grams present initially. A radioactive is a radioactive form of an element that will undergo radioactive decay
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Atoms that share electrons have what type of bonds?
Atoms that share electrons have a covalent bond.
There are three ways that the electrons that exist on the outer layer of atoms can form atomic bonds:
Ionic bondAn ionic bond is a bond that involves the electrostatic attraction between oppositely charged ions/two atoms with different electronegativities.
Covalent bondA covalent bond is a bond in which two or more atoms share their valence electrons.
Metallic bondA metallic bond is a bond in which the bonding electrons are delocalized over a lattice of atoms.
Attached below is an image of a covalent bond that is forming the compound H₂. In it, two hydrogens (H) atoms share each of their electrons.
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aldehydes have a central carbon bound to two other carbons (True or False)
False. The carbonyl group (C=O) and a central carbon are both linked together in an aldehyde.
What constitutes carbon?The nucleus of a carbon atom is made up of six protons and six neutrons, and it is encased in six electrons. According to quantum physics, the first free atoms must occupy the innermost atomic orbiting, while the wavefunctions of the following four electrons only partially fill both first normal and three second primary orbitals.
What uses does carbon serve?Metal smelting makes use of impure acid in the presence of coke made from coal and charcoal made from wood. For steel and iron sectors in particular, it is essential. Graphite is utilized in furnace linings, electric motor brushes, and pencils. Activated charcoal is employed in filtering and purification processes.
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why do purines bond with pyrimidines in the dna ladder??
In order to preserve the regular structure of the Plasmid dna or DNA helical helix, purines and pyrimidines must bond. Thymine must bind nutrients to form DNA molecules. Because of this, It is now more stable than RNA.
What is DNA exactly?Deoxyribonucleic acid, also known as DNA, seems to be the molecule that contains the genetic material necessary for an organism's growth and operation. The structure of DNA is a double helix, which is made up of two connected strands that loop around one another to like a twisted ladder.
What is Mtdna and what does it do?The information molecule is DNA. It contains information needed to create proteins, which are other big molecules. Each of your cells contains 46 long proteins genetic code that serve as a distribution point for these instructions.
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in the chapter, we stated that the imine in this reaction is reduced. verify that this is the case by calculating the oxidation state of the c and n atoms of the cwn group before and after the reaction has taken place. does the imine gain electrons? if so, how many?
The imine gains two electrons, as the oxidation states of both the carbon and nitrogen atoms have decreased.
What are the before and after reactions of CN group ?
Before Reaction: The carbon atom in the CN group has an oxidation state of +3 and the nitrogen atom has an oxidation state of -3.
After reaction: The carbon atom has an oxidation state of +2 and the nitrogen atom has an oxidation state of -2.
Reaction involvement: The reaction involves the loss of two electrons from the CN group, resulting in the oxidation states of both the carbon and nitrogen atoms decreasing. The transfer of electrons from the CN group to the imine results in the carbon atom in the CN group being reduced from +3 to +2 and the nitrogen atom being reduced from -3 to -2. This transfer of electrons is an oxidation-reduction reaction, as the oxidation states of both the carbon and nitrogen atoms have decreased.
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Which action most likely helped form feature X?
The action that most likely helped form feature X is B. Sediments were deposited where the river met the ocean.
What is a Land Form?An anthropogenic or natural land feature on the solid surface of the Earth or another planetary body is referred to as a landform.
A given terrain is made up of several landforms, and topography refers to how these landforms are arranged in the surrounding area.
Hence, feature X on the given map was most likely formed through the deposition of sediments.
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Which action most likely helped from feature X?
answer choices
Wind blew sand from the beach into large piles.
Sediments were deposited where the river met the ocean.
Waves pushed mud from the bottom of the ocean onto land.
Land was exposed when water was pulled offshore during low tide.
a combination of two or more atoms of the same type is called?
A molecule is made up of two maybe more atoms that are chemically linked together, regardless they be of the same component or distinct ones. In the natural world, molecules of oxygen exist.
What is the straightforward meaning of a molecule?Pay attention to how it sounds. a material's smallest unit that contains both its chemistry and physical properties. A molecule is made up of one or more ions.
Water: A Molecule or Not?Molecules are created when atoms come together. Two hydro (H) atoms but one oxygenation (O) atom make up the three atoms that make up a water molecule. As a result, water is sometimes shortened as H2O.There are hundreds of water molecules in a single drop of liquid.
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a mixture of these two compounds, x, reacts with exactly 0.125 mol of dilute hydrochloric acid. what was the mass of calcium oxide in mixtrue x?
To determine the mass of calcium oxide in the mixture "x", we need to know the chemical equation. Assuming that the reaction is CaO + HCl -> CaCl2 + H2O, and using the balanced equation and the amount of hydrochloric acid given (0.125 mol), the amount of calcium oxide in the mixture can be calculated.
About CalciumCalcium or lime is a chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is one of the alkaline earth metals, and is the fifth most abundant element on earth. Calcium is a mineral that is very important for humans, including for the body's metabolism, connecting between nerves, the work of the heart, and muscle movement.
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what statement describe a soruce of new gentic vartions species
The statement describe a source of new genetic variations in species is the sexual reproduction results in offspring that each have a unique set of genes. Therefore, option B is correct.
What is genetic variation ?The term genetic variation is defined as the difference in DNA sequences between individuals within a population. The main source of genetic variation is mutation.
New genetic variation originates in a species as a result of sexual reproduction which results in offspring made up of a unique set of genes.
In sexual reproduction, there is an exchange of materials between sexes and the new combination formed a varied form of the original genetic materials.
Thus, option B is correct.
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Your question is incomplete, most probably your question was
Which statement best describes a source of new genetic variations in a species? A. Asexual reproduction produces many offspring with a successful set of genes.
B. Sexual reproduction results in offspring that each have a unique set of genes.
C. Lifelong leaming helps offspring with the same parents have different skills.
D. Limited resources cause some offspring to survive longer than others,
If we reduce the volume in the vessel and the new pressure is measured to be 40 atm, what would the new volume be? a. 10 Lb. 5 Lc. 3.33 Ld. 2.5 L
At a pressure of 40 atm, the gas's new volume will be 2.5 L. As a result, choice (D) is the right one.
Describe Boyle's law.
According to Boyle's law, the pressure a given mass of gas exerts at a given temperature is inversely proportional to the volume that it occupies.
If the temperature remains constant, the relationship between the pressure and volume is inverse.
P ∝ 1/V
or
P₁V₁ = P₂V₂ ................(1) (1)
Given that the gas's starting pressure is P1 = 10 atm
The gas's ultimate pressure, P2, is 40 atm.
The gas's initial volume, V1, is equal to 10 L.
Replace the volume and pressure numbers in equation (1);
(40 atm) V2 = (10 atm) (10 L)
V₂ = 100/4
V₂ = 2.5 L
Consequently, the gas's new volume will be 2.5 L. 40 atm of pressure is increased,
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Since an electron has a negative charge, it will move in an electromagnetic field under the Coulomb force. When an electron moves in the opposite direction as the direction of the electric field, we can conclude that: A. It moves from a high potential to a low potential, and its electric energy decreases. B. It moves from a low potential to a high potential, and its electric energy decreases. C. Both its electric potential and electric potential energy stay constant. D. It moves from a low potential to a high potential, and its electric energy increases. E.It moves from a high potential to a low potential, and its electric energy increases.
Option D: It loses electric potential energy when it transitions from a high potential to a low potential. When put in an electric field, a positive charge has a tendency to flow along the lines of the electric field.
What is the straightforward meaning of potential energy?Potential energy is a form of stored energy that is dependent on the link between different system components. When a spring is squeezed or extended, its potential energy increases.
What is children's potential energy?Potential energy refers to the energy that an item has stored in it as a result of its location or condition. Potential energy exists in a stretched spring, a newspaper held over his head, and a cycle on top of a mountain.
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how many moles are in 4a.5 x 1022 molecules/atoms of co2?
In 4.5 × 10²² CO₂ molecules, there would be 0.075 moles, based on the supplied assertion.
What impacts the body does CO₂ have?Numerous health impacts from exposure might be experienced. These symptoms can include a coma, hypoxia, convulsions, sweating, a tingling or pins-and-needles sensation, headaches, disorientation, unrest, a tingling or pins-and-needles feeling, and difficulty breathing.
What does having a high level mean?Too much in your blood indicates that the liver is not properly eliminating it (hypercapnia). Blood levels that are higher than usual may indicate a health issue such respiratory or hyperkalemia. Cushing's disease.
moles = particles / Avogadro's number
Plugging in the number of particles and Avogadro's number, we get:
moles = 4.5 × 10²² molecules / 6.022 × 10²³ particles/mole
= 0.075 moles
So, there are 0.075 moles in 4.5 × 10²² molecules.
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the chemical release of _________ plays a role in bonding and forming secure relationships.
A potent hormone known as oxytocin serves the brain as a neurotransmitter. Oxytocin can be released in response to almost every good or bonding interaction.
What results in the energy release from a chemical bond?Exothermic refers to chemical reactions that release energy. When bonds are created in the products of exothermic processes, more energy is produced than is required to break the bonds between the reactants. The temperature of the reaction mixture rises as a result of exothermic reactions.
What kind of chemical bonds does carbon form, and why?Covalent bonds are the most typical kind of bonds that carbon may form. Carbon typically exchanges electrons with other atoms. This is due to the fact that carbon has 4 valence electrons and must either obtain 4 more electrons or lose 4 electrons in order to complete its octet configuration.
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Find the density of a 50 g irregular solid with a volume 75 milliliters
0.666g/ml is the density of a 50 g irregular solid with a volume 75 milliliters. Another way to state density is in kilograms per cubic meter.
What is density?Density is the mass of a specific material per unit volume. d = M/V, in which d is density, M is weight, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.
For instance, whereas Earth has a density of 5.51 milligrams, water has a density of 1 milligrams. Another way to state density is in kilograms per cubic meter (in metre-kilogram-second or SI units).
density=mass/ volume
=50 g /75 milliliters=0.666g/ml
Therefore, 0.666g/ml is the density of a 50 g irregular solid with a volume 75 milliliters.
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2. (a) what is meant by the term reaction rate? (b) name three factors that can affect the rate of a chemical reaction. (c) what information is necessary to relate the rate of disappearance of reactants to the rate of appearance of products?
The change in concentration of a reactant or product over time is known as the rate of reaction.
Many various parameters, such as reactant concentration, surface area, temperature, and catalysts, affect the pace of a chemical reaction.
A)The pace at which the products are created from the reactants in a chemical reaction is referred to as the rate of reaction.
The change in concentration of a reactant or product per unit of time is the speed or rate of a chemical reaction. To be more precise, it might be stated as follows: the pace at which the concentration of any of the reactants is decreasing. the rate at which any product's concentration is rising.
B)Catalysts, surface area, temperature, and reactant concentration all have an impact on the pace of a chemical reaction.
C)In order to compare the rate of product disappearance to the rate of product appearance. The reactant and product's state psychometric coefficient should be known.
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a student records the temperature of several water samples as shown in the table. other than the temperature, the water samples are the same. which sample has the lowest kinetic energy?
Solid particles have the least kinetic energy because they are unable to move due to their dense packing.
Which sample does have the kinetic energy average that is lowest?The second lowest kinetic energy for gases is found in argon and nitrogen, both of which are at a temperature of 20°C. This is because particle at the same temperatures share the same average kinetic.The maximum average kinetic energy is found in nitrogen and helium at a temperature of 100 °C.
Which best represents the objects with the lowest kinetic energy?Solid-state molecules contain the least energy, whereas gas particles have the greatest.The heat of a substance is used to calculate the average particle kinetic energy.
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which of the following statements is true concerning ideal gases? group of answer choices at stp, 1.0 l of ar(g) contains about twice the number of atoms as 1.0 l of ne(g) since the molar mass of ar is about twice that of ne. the pressure exerted by a gas decreases as the collisions of the gas particles with the walls of the container increases. the pressure would decrease when the temperature of a closed sample of a gas is increased while its volume is decreased. the gas particles in a sample of a gas repel each other, but do not attract one another. the average kinetic energy of the gas particles would increase when the temperature of a closed sample of a gas is increased while its volume is decreased.
The statements that is true concerning the ideal gases is the correct option is : the average kinetic energy of the gas particles would increase when the temperature of a closed sample of a gas is increased while its volume is decreased.
The ideal gas equation is as follows :
P V = n R T
Where
The p is the pressure of the gas
The V is the volume of the gas.
n is the number of the moles
The R is gas constant.
The T is the temperature.
Th pressure is directly related to the temperature and the average kinetic energy. The average kinetic energy will increases as the temperature increases.
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Formation of a phosphodiester bond requires which functional groups? (Select all that apply)Carboxyl group (-COOH)Amino group (-NH2)Carbonyl group (>C=O)Hydroxyl group (-OH)Phosphate group (-OPO32")
In order to form, a phosphodiester bond requires both a hydroxyl group (-OH) and a carboxyl group (-COOH).
The functional groups: what are they?An atom or a group of atoms inside a molecule that share chemical characteristics when they appear in different compounds is referred to as a functional group. Certain functional groups have a tendency to behave in a certain way, even though other components of the molecule are very different.
How are functional groups identified?To separate functional categories within the name, their prefixes and suffixes will differ. For instance, amine functional group uses the prefix "amino-" if it is a substituent and the suffix "-amine" if it is the highest priority group.
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true or false: a rigid tank containing ionized gases kept under the influence of a magnetic field is a simple compressible system.
False. A rigid tank containing ionized gases kept under the influence of a magnetic field is not a simple compressible system.
Is keeping under magnetic field influence simple?
A simple compressible system is defined as a system where the pressure, volume, and temperature are related by a simple equation of state, such as the ideal gas law. In such a system, the pressure, volume, and temperature are independent variables, and changes in one of them result in changes in the others.
However, in the case of a rigid tank containing ionized gases kept under the influence of a magnetic field, the behavior of the gases is not described by a simple equation of state. The magnetic field affects the motion of charged particles and creates complex interactions between the particles and the field. This results in a more complex behavior that cannot be described by a simple equation of state.
Therefore, a rigid tank containing ionized gases kept under the influence of a magnetic field is not a simple compressible system.
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how would you describe the different types of polymerization techniques and how do they produce different properties of polystyrene?
Emulsion polymerization is a radical polymerization technique that uses a monomer, emulsion-containing water, and a surfactant. Polystyrene for general use is transparent, rigid, and brittle.Per unit weight, it is a reasonably priced resin.
What methods are used to prepare polymers?However, a number of techniques, including desolvation, hemodialysis, ionic gelation, holding the other variables, solvent extraction, salting out, spray drying, and supercritical fluid, are employed to create polymeric nanoparticles.However, a number of considerations must be taken into consideration while choosing a strategy.
What equipment is employed in polymerization?Twin-screw extruders were created primarily to make mixing and compounding procedures easier, but they are also used as polymerization reactors.
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when single electrons occupy different orbitals of the same sublevel
When single electrons occupy different orbitals of the same sublevel, they all have the same spin.
What are the four electron-holding orbitals?According to current theory, orbitals are where electrons reside. An orbital is an area of space where detecting an electron has a high likelihood. The four fundamental kinds of orbitals are s, p, d, and f. The spherical form of a s orbital can accommodate two electrons.
How many electrons do the KLMN shells contain?The KLMN notations show how many electrons there are overall for each n-bit main quantum number. The atomic number of the neutral chlorine atom is 17. It has 17 electrons inside, which are dispersed throughout its atomic shells. However, we are required to determine the chloride ions' electrical arrangement.
Can all orbitals accommodate two electrons?Two electrons with the opposite spin can fit into any orbital at most. Two electrons are housed in the first shell's one 1s orbital. Eight electrons, two in a 2s orbital and six in three 2p orbitals, are located in the second shell. There are 18 electrons in the third shell, with two in a 3s orbital, six in three 3p orbitals, and ten in five 3d orbitals.
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twenty grams (20 g) of sodium chloride is placed into a beaker. the mass of both the salt and the beaker is 230 grams. what is the mass of the beaker?
In the case of Twenty grams (20 g) of sodium chloride is placed into a beaker the mass of the beaker is 210 grams.
We may take the combined mass of the beaker and salt and subtract the mass of the sodium chloride to get the beaker's mass. We are aware that 20 grams of sodium chloride are present. The salt and beaker together weigh 230 grams. When the mass of the sodium chloride is subtracted from the total mass, we obtain:
Let's name the beaker's mass "m."
We therefore have:
m + 20 g = 230 g
20 g are subtracted from both sides:
m = 210 g
The beaker, therefore, weighs 210 grams.
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describe the properties of water that influenced your investigation and how this was reflected in your results. (properties of water can include, but are not limited to, water potential, adhesion, cohesion, and surface tension.)
Adhesion and cohesion are two characteristics of water that have an impact on our experiment.
Water molecules have the ability to adhere to other things through their ability to adhere to one another, known as cohesion. Because we saw that the water was able to go up the paper towel more and more as the sugar content increased, these characteristics were represented in our findings. This is because the sugar molecules enhanced the water's surface tension, which, along with the cohesive forces of the molecules, allowed the water to stick to the paper towel more effectively and go higher up the towel. The water was able to go farther up the paper towel due to the increased surface tension and water potential. This is evident from our data, which show that the 0.20M travelled the farthest.
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Which Group is in the leftmost column on the periodic table?
A. Halogens
B. Alkali metals
C. Noble gases
D. Alkaline earth metals
The group which is present in the left most column in the periodic table is alkali metals.
What is periodic table?
Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
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what happens to the freezing point of water when ethylene glycol is added?a)(a) , (b)-, (c) b)(a) -, (b)-, (c) c)(a) , (b)-, (c) -
The freezing point of the solution decreases compared to pure water.
When ethylene glycol is added to water, the freezing point of the solution decreases compared to pure water.
This is because ethylene glycol is a non-volatile, non-ionic solute that decreases the freezing point of water by lowering the temperature at which ice forms.
This is due to the fact that the solute molecules interfere with the hydrogen bonding between the water molecules, making it harder for the water molecules to arrange themselves into the ordered structure of ice.
As a result, the freezing point of the solution is lowered, and the solution remains liquid at lower temperatures than pure water.
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25. The percentage of 'Active Air' which supports burning is about A. 0.3 B. 21.0 C. 25.0 D. 33.3 E. 78.0
The percentage of 'Active Air' which supports burning is about is 21.0. The correct option is B
What is active air?Active air" can be defined as the portion of air that is available for combustion. It typically refers to the concentration of oxygen in the air as oxygen is the essential component for most forms of combustion to occur.
Therefore, The percentage of 'Active Air' which supports burning is about 21.0, or 21%. This refers to the amount of oxygen in the air that is available for combustion as the remaining 79% of the air is made up of nitrogen and other non-combustible gases.
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