The f-sublevels of the lanthanide and actinide elements are only partially occupied. Whereas transition metals exists in various oxidation states.
An atom's electron configuration shows how electrons are distributed among its orbital shells and subshells.
The electron configuration typically describes the orbitals of an atom in its ground state, but by compensating for any lost or gained electrons in the orbitals that follow, it can also be used to represent an atom that has ionized into a cation or anion.
Chemical elements that are members of the lanthanide class have valence electrons in the 4f orbitals. Chemical elements that belong to the actinide class have valence electrons in their 5f orbitals. Because they have a large number of shells, inner transition metals are made up of rather hefty atoms.
To know about actinides
https://brainly.com/question/13760918
#SPJ4
what are the products when an ester undergoes acid hydrolysis?
When an ester is subjected to acid hydrolysis, water is added to help break it down into its individual carboxylic acid and alcohol components.
What is ester?A carbonyl group (C=O) is attached to an alkoxy (-O-R) group, where R is an alkyl or aryl group, to form an ester, a particular type of organic chemical.
The acid protonates the carbonyl carbon of the ester during the reaction, making it a suitable leaving group. The resultant intermediate subsequently reacts with water, and the hydroxide ion then attacks the carbonyl carbon as a nucleophile. The protonated ester acts as the leaving group, which is then ejected from the reaction via an SN2 mechanism, resulting in the production of the carboxylic acid and alcohol components. The nature of the original ester and the acid catalyst in use determine the precise products of an ester's acid hydrolysis.
To know more about ester, visit:
https://brainly.com/question/10840252
#SPJ4
13. a metal bar weighs 196 lbs. if the bar is 72% iron, 18% chromium, and 10% nickel, what is the weight of iron (in g) in the bar?
A metal bar weighs 196 lbs, if the bar is 72% iron, 18% chromium, and 10% nickel, the weight of iron (in g) in the bar is 2953.2 gm.
To calculate the weight of iron in the metal bar, use the following equation:
= Weight of Iron (g)
= (Weight of Bar (lbs) x Percent Iron (fraction)) / (Molecular Weight of Iron (g/mol))
For iron, the molecular weight is 55.85 g/mol.
Therefore, the weight of iron in the bar is:
= Weight of Iron (g)
= (196 lbs x 0.72) / 55.85 g/mol
= 2,953.2 g
To know more about metal please refer: https://brainly.com/question/29404080
#SPJ4
if only cof2 is present initially at a concentration of 2.00 m , what concentration of cof2 remains at equilibrium?
If only cof2 is present at a concentration of 2.00 m at the start, the equilibrium concentration of cof2 is 0.388 M.
Kc=[CO2][CF4]/[COF2]2
let [CO2] = [CF4] = x
then [COF2] = 2.00 - 2x
[tex]\frac{x^{2} }{(2.00-2x) ^{2}}[/tex]=4.30
x=0.806
concentration of [COF2] = 2.00 - 2x = 0.388 M
Equilibrium is a state in a process in which the observable properties such as color, temperature, pressure, concentration, and so on do not change.
The word equilibrium means 'balance,' implying that a chemical reaction represents a balance between the reactants and products involved in the reaction. The equilibrium state is also observed in certain physical processes, such as the melting point of ice at 0°C, where both ice and water are present.
The equilibrium associated with physical processes such as solid melting, salt dissolution in water, and so on is known as physical equilibrium, whereas the equilibrium associated with chemical reactions is known as a chemical equilibrium.
Learn more about Equilibrium here:
https://brainly.com/question/29359870
#SPJ4
The complete question is:
2COF2(g)⇌CO2(g)+CF4(g), Kc=4.30
If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium?
a 25.0-ml sample of 0.10 m c2h5nh2 (ethylamine) is titrated with 0.15 m hcl. what is the ph of the solution after 9.00 ml of acid have been added to the amine? [kb(c2h5nh2)
Titration with 0.15 m hcl is performed on a 25.0-ml sample of 0.10 m c2h5nh2 (ethylamine). After adding 9.00 ml of acid to the amine, the solution's pH is 10.88.
In addition to being a solvent extractor and a dye intermediate, ethylamine is also useful for chemical synthesis, rubber and detergent stabilization, petroleum refining, and solvent extraction. Ethylamine | PubChem | C2H5NH2. It turns into a liquid that is miscible with almost all solvents when it condenses just below room temperature. Like other amines, it is a nucleophilic base. The chemical industry and organic synthesis frequently use ethylamine.
Learn more about ethylamine from here:
https://brainly.com/question/9439418
#SPJ4
uranium-238 decays into thorium-234 plus an alpha particle. how much energy is released in this process
The energy released in the process of α-decay of U-238 into Th-234 is 4.274 MeV.
Since the binding energy released (spontaneous decay processes must be exoergic) corresponds to a loss of mass, the decay energy can be computed from the known atomic masses. The Q-value of the reaction is another name for this energy.
[tex]Q_{a}[/tex] = -931.5 ([tex]M_{Th} + M_{He} - M_{U}[/tex])
= - 931.5 (234.043 + 4.002 – 238.050) = 4.274 MeV.
Alpha particle decay typically occurs in large materials like uranium. A helium nucleus with two protons and two neutrons makes up an alpha particle. Thus, Uranium will lose two protons and two neutrons. U-238 contains 146 neutrons and 92 protons (238-92). It will have 90 protons and 144 neutrons if it loses 2 protons and 2 neutrons. Thorium, abbreviated Th, is the element having 90 protons and will have a mass number of 144 + 90 = 234. You will therefore be surrounded by an alpha particle and thorium-234.
To know more about alpha decay, refer:
https://brainly.com/question/29205436
#SPJ4
carbon-14 has a half life of 5730 years. how many years have passed when 1/4th of the original amount of carbon-14 remains?
Carbon-14 has a half life of 5730 years. So, approximately 5530 years have passed when 1/4th of the original amount of carbon-14 remains.
The number of years that have passed when 1/4 of the original amount of carbon-14 remains can be determined by using the equation for radioactive decay:
N = N0 * [tex](1/2)^{(t/T)}[/tex]
where,
N = the amount of radioactive isotope at time t,
N0 = the initial amount of radioactive isotope,
t = the time that has passed,
T = the half-life of the isotope.
Setting N equal to N0 / 4 and solving for t:
t = T * ln(2) * ln(N0/N)
Plugging in the known values:
T = 5730 years, N0 = N0, N = N0 / 4
t = 5730 * ln(2) * ln(N0/N0 / 4)
t = 5730 * ln(2) * ln(4)
t = 5730 * 0.693 * 1.386
t = 5730 * 0.961
t ≈ 5530 years
So, approximately 5530 years have passed when 1/4th of the original amount of carbon-14 remains.
Here you can learn more about the original amount of carbon-14
brainly.com/question/14220374
#SPJ4
Before adding a sample or solvent to a separatory funnel, what should you have in place?
Before the addition of a sample or solvent to a separating funnel, we must have a funnel in the top of the separatory funnel along with a stopcock in the closed position and definitely a flask under the separatory funnel.
A separatory funnel must be vented to make sure that there is no gas buildup. It could unintentionally push the liquid or stopper out of the funnel.
The separatory funnel should be turned in gently while holding the stopper. The pointed end points upward and away from any persons or significant laboratory apparatus.
To protect the analyst from solvent vapor exposure, the separatory funnel needs to be vented into a hood. 7.6 At least 10 minutes should pass while the organic layer separates from the aqueous phase.
To learn more about separatory funnel:
brainly.com/question/14504717
#SPJ4
for a liquid to be used in the determination of the volume of a solid by the displacement method, which criteria does not have to be met?
A liquid to be used in the determination of the volume of a solid by the displacement method, the criteria must be met are that the the liquid is less dense then the volume and the liquid cannot dissolve in water can't react with a solid.
1. Kinetic energy should be completely eliminated from the sample.
2. The temperature of the sample should ideally reach the corresponding freezing point.
3. The particles in the sample must be absolutely deprived of certain energy. This is done so that the attraction of the molecules in the sample for one another exceeds the force that usually separates them.
Process of Freezing:
All the particles are in clusters. This process is referred to as freezing.
Learn more about Freezing here:
brainly.com/question/24314907
#SPJ4
suppose there is a gaseous mixture of nitrogen and oxygen. if the total pressure of the mixture is 470 mmhg , and the partial pressure of nitrogen is 220 mmhg , calculate the partial pressure of oxygen in the mixture using dalton's law.
The partial pressure of oxygen in the mixture is 250 mmHg by using given dalton's law as per follow.
According to Dalton's law, the combined pressure of a gas mixture is equal to the sum of the individual partial pressures of its constituents.
In this instance, the total pressure of the mixture (Ptotal) as well as the partial pressure of b (P N2) are both provided.
As a result, the partial pressure of oxygen (P O2) can be determined using the formula: PO2 = Ptotal - PN2 = 470 mmHg - 220 mmHg = 250 mmHg
Nitrogen and oxygen are present as a gaseous mixture. The partial pressure of oxygen (P O2) is equal to 250 mmHg if the overall pressure of the mixture is 470 mmHg and the partial pressure of nitrogen is 220 mmHg.
Learn more about partial pressure here:
https://brainly.com/question/13199169
#SPJ4
Is the dissolution reaction of ammonium nitrate enthalpy favored? a. No, it is not enthalpy favored since the chemical system loses energy. b. Yes, it is enthalpy favored since the chemical system loses energy. c. No, it is not enthalpy favored since the chemical system gains energy. d. Yes, it is enthalpy favored since the chemical system gains energy. e. No, it is not enthalpy favored since the chemical system neither gains nor loses energy.
c. No, it is not enthalpy favored since the chemical system gains energy.
What causes ammonium nitrate to dissolve?An endothermic reaction occurs when ammonium nitrate dissolves in solution. As the ammonium nitrate breaks, heat energy from the environment is absorbed, causing the area to feel cold.
NH4NO3(s) = NH4 + (aq) + NO3 (aq) H = +28.
What transpires when water is dissolved with ammonium nitrate?Because the reaction is endothermic, meaning it takes energy from the surroundings in the form of heat, the beaker turns cold when ammonium nitrate is mixed with water. As a consequence, the endothermic reaction of hydrating ammonium nitrate leads the beaker to become cold.
What do you mean by dissolution?A solute in a gaseous, liquid, or solid phase could dissolve in a solvent to produce a solution through to the process of dissolution.
Learn more about ammonium nitrate here:
brainly.com/question/11978995
#SPJ4
a cylinder contains 18 moles of a monatomic ideal gas at a constant pressure of 160 kpa. (a) how much work does the gas do as it expands 3200 cm3, from 5400 cm3 to 8600 cm3? (b) if the gas expands by 3200 cm3 again, this time from 2200 cm3 to 5400 cm3, is the work done greater than, less than, or equal to the work found in part (a)? (c) calculate the work done as the gas expands from 2200 cm3 to 5400 cm3.
(a) The work done the gas do as it expands 3200 cm³, from 5400 cm³ to 8600 cm³ is
(b) The work done is same as the change in the volume is same.
(c) The work done as the gas expands from 2200 cm³ to 5400 cm³ is 5120 J
(a) The pressure of the ideal gas, P = 160 kpa = 160 × 10³ pa
The expansion of the volume of gas, ΔV = 3200 cm³ = 3200 × 10⁻⁶ m³
The work done is as follows :
W = PΔV
W = 160 × 10³ × 3200 × 10⁻⁶
W = 5120 J
(b) The work done is same as the change in the volume is same.
(c) The work done is given as :
W = 160 × 10³ × 3200 × 10⁻⁶
W = 5120 J
Therefore the work is same.
To learn more about work done here
https://brainly.com/question/28186645
#SPJ4
True or False? aldehydes have a central carbon bound to two other carbons
False. No central carbon is bonded to two additional carbons in aldehydes.
Describe aldehydes.The carbon atom in every member of the category of organic compounds called as an aldehyde has three single bonds, one with hydrogen, another with oxygen, and the one with another atom as well as a group of atoms (marked "R" in standard chemical formulae & structure diagrams).
What distinguishes an aldehyde from a ketone?A carbonyl group is joined to the carbon atom there at end of the carbon chain to form an organic molecule known as an aldehyde. An organic molecule known as a ketone is one in which a carbonyl group is joined to the carbon atom with in carbon chain.
To know more about aldehyde visit :
https://brainly.com/question/1792281
#SPJ4
at standard conditions, the equilibrium lies toward products for a given biochemical reaction. what is known about the change in free energy?
The correct option is C. ΔG°is less than 0 is known about the change in free energy.
Gibb's unfastened power is known as unfastened power due to the fact Gibb's energy is effortlessly available every time. If required the reaction can get this electricity without having to paint for it. The trade-in Gibb's unfastened power is the sum of enthalpy and the made of temperature and entropy of the gadget.
Gibbs's unfastened strength is denoted via the symbol 'G'. Its price is usually expressed in Joules or Kilojoules. Gibbs's loose energy can be defined because of the most quantity of work that can be extracted from a closed system. In line with the legal guidelines of thermodynamics, unfastened power is the energy it truly is available to be used at a given time. The legal guidelines of physics, consequently, imply that it's impossible for the quantity of to be had the energy to be countless.
To learn more about Free energy visit here:
brainly.com/question/15319033
#SPJ4
Complete Question:
At standard conditions, the equilibrium lies toward products for a given biochemical reaction. what is known about the change in free energy?
Choose one:
A.ΔG°equals 0.
B.ΔG°is greater than 0.
C.ΔG°is less than 0.
D.ΔG°is are unknown.
Label the plate boundaries and name a geologic feature that occurs at each plate
boundary
Note that the three types of plate boundaries are:
TransformConvergent and Divergent plate boundaries.What geological features can be found in each type of boundary?The geological features that can occur in each type of boundary are given as follows:
1) Divergent plate boundaries occur when plates move apart and magma rises to the surface to form new crust. A geologic feature that occurs at a divergent plate boundary is a mid-ocean ridge.
2) Note that convergent plate boundaries occur when plates collide and one plate is forced beneath the other, into the mantle. A subduction zone is a geologic feature at a convergent plate boundary.
3) In the case of transform plate boundaries, it occurs when plates slide past each other along a transform fault. A geologic feature that occurs at a transform plate boundary is a strike-slip fault.
Learn more about Plate Boundaries;
https://brainly.com/question/29712139
#SPJ1
beta-sheets are a type of secondary structure and are found in every protein. T/F
False. Beta-sheets are not present in every protein as a part of secondary structure.
Why are beta sheets used?One of the most popular ways to create oligopeptide-based materials acting as model stem cell habitats is by sheet assembly. When hydrophobic and hydrophilic peptides side chains get positioned on different sides of such a peptide backbone, strands are formed.
What does a protein's beta sheet do?Protein secondary structures include beta-pleated sheets of protein. It is made up of a number of different beta strands that are joined together by hydrogen bonds. A beta-strand polypeptide is made of three to 10 amino acids.
To know more about beta sheet visit :
https://brainly.com/question/17003992
#SPJ4
what is meant by the statement “fibers have a high length to width ration”?
"Fibers have a high length to width ratio," which implies that fibers are substantially longer than they are wide. Fibers, in other words, are long, thin elongated structures.
What is meant by the statement “fibers have a high length to width ration”?The phrase "fibers have a high length to width ratio" suggests that fibers are much longer than they are wide. Fibers, in other terms, are elongated structures having a long, thin form. Fibers have qualities that make them valuable in a variety of applications, such as the fabrication of textiles, paper, and composites, due to their high length to width ratio. Fibers having a high length to width ratio, for example, can be woven or twisted together to make strong, durable textiles.
To know more about fibers,
https://brainly.com/question/28204671
#SPJ1
calculate the number of grams of nan3 that must be used to generate the amount of n2 necessary to properly inflate the air bag
92.3g NaN3 number of grams of nan3 that must be used to generate the amount of n2 necessary to properly inflate the airbag
The reactant utilized to create the N2 (nitrogen) gas that inflates the airbag is NaN3. This process's (reaction's) relationship is based on a balanced equation. Additionally, the moles of the initial reactant, NaN3, determine the amount of N2 gas produced mathematically. As a result, start by writing the balancing equation.
2. Based on the mole ratio in the balanced equation, perform a dimensional analysis (mathematical conversion) from grams of NaN3 to grams of N2. The reactant (NaN3, 65.01 g/mol) and product (N2, 28.00 g/mol) molar masses (MW) will be involved.
the balanced equation is -> 2 NaN3 --> 3 N2 + 2 N
59.6g x (1mol N2 / 28.00g N2) x (2mol NaN3 / 3mol N2) x (65.01g NaN3 / 1mol NaN3) = 92.3g NaN3
To learn more about airbags please visit -
https://brainly.com/question/10025506
#SPJ4
A carbon skeleton is covalently bonded to both an amino_________.
A carbon skeleton is covalently bonded to both an amino groups and carboxyl group.
How are covalent bonds made?A covalent bond occurs when two atoms interchange one or more pairs of electrons. The two atomic nuclei are mutually attracting these electrons to them. When the difference between the electronegativities of two atoms is too tiny for an electron transfer to actually happen to produce ions, a covalent bond is created.
What distinguishes an amino acid from a carboxyl acid?The carboxyl group is generally deprotonated and has a negative charge, meanwhile the amino group typically has a positive charge and is protonated. The R group, a secondary atom or group of atoms connected to the central atom in every amino acid, that's what gives the amino acid its identity.
Learn more about carbon here:
brainly.com/question/24106659
#SPJ4
how many 1h nmr signals does following dimethylcyclopropane isomer show? enter your answer in the provided box.
There are three NMR signals present in the given isomer of dimethylcyclopropane.
The number of NMR signals is defined as the number of different types of protons in a molecule. NMR signal is the example we used in the introduction to NMR spectroscopy. The spectrum has five signals which basically indicates five types of different protons.
The given compound is shown in Fig(i).
The name of the compound is (1R, 2R)-1,2- dimethylcyclopropane.
The above molecule has plane of symmetry which is shown in Fig(ii).
So, the given molecule has three types of protons. The denotation of three types of protons are shown in Fig (iii).
Hence, the number signals is three.
Learn more about NMR signals from the link given below.
https://brainly.com/question/29885193
#SPJ4
c4h8 decomposes in a first order reaction, with a rate constant of 85.0 s-1 to two molecules of c2h4. if the initial concentration of c4h8 is 2.20 m, what is the concentration after 0.0120 s?
The concentration after 0.0120 s is 0.808 m
The decomposition of C4H8, occurring in a first-order reaction, is characterized by a rate constant of [tex]85.0 s^{-1[/tex], resulting in the formation of two molecules of C2H4.
The rate of the reaction is dependent on the concentration of the reactant, C4H8, following a specific mathematical relationship. This relationship, represented by the rate equation,
d[C4H8]/dt = -k[C4H8], expresses the change in concentration over time, where k represents the rate constant.
By solving the differential equation, [C4H8] = [C4H8]0 * [tex]e^{(-kt)}[/tex], with the initial concentration of C4H8, [C4H8]0, equal to 2.20 m and t equal to 0.0120 s, we can determine the concentration of C4H8 after that specific time interval.
Plugging in the values, we get [C4H8] = 2.20 m * [tex]e^{(-1.02)}[/tex] = 0.808 m.
Thus, the reaction, with its unique rate constant and mathematical relationship, transforms the initial concentration of C4H8 into a new concentration, exhibiting the dynamic nature of chemical reactions.
To learn more about decomposition:
https://brainly.com/question/14608831
#SPJ4
how many moles of oxygen gas are in a balloon containing 20.0 grams of pure oxygen gas?
According to the question we have, a balloon carrying 20.0 grams of pure oxygen gas has 1.25 moles of oxygen gas.
Why O2 is the name given to oxygen O is not?All of the drug molecule are displayed in chemical equations thanks to the way they are written. Each oxygen molecule consists of two oxygen atoms, which is why it is represented by the symbol [2]. Note: Diatomic molecules, which contain just two oxygen atoms, are what we breathe.
You may determine a substance's moles using this formula: moles = mass / molar massThe oxygen gas has a molar mass of 16.00 g/mol.
Therefore, moles equals 20.0 g / 16.00 g/mol, or 1.25 moles, in a balloon filled with 20.0 grams of oxygen gas.
To know more about Oxygen visit :
https://brainly.com/question/13905823
#SPJ4
What term describes a solution which is in equilibrium with an undissolved solute?
A) precipitating
B) aqueous
C) saturated
D) unsaturated
E) supersaturated
The mixture is categorized as a saturated solution. It is said that the solution is in equilibrium.
Saturated solution: What is it?A solvent is a substance that contains as much solute as is actually capable of breaking down under the conditions within which it is expressed. By examining components and the solution's characteristics, one can understand how a mixture can reach a condition of absorption.
What takes place when a solution achieves saturation?At some time, the solution reaches its saturation point. This suggests that perhaps if you add more of the chemical, it might prevent dissolving as well as stay solid. The frequency depends on the molecular interactions between the solution and the molecule.
To know more about saturated solution visit:
https://brainly.com/question/1851822
#SPJ4
What is the percentage by mass of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO3) ?
A: 44.2%
B: 37.7%
C: 27.4%
D: 16.7%
The percentage by mass of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO₃) is 27.4% (Option C)
How to determine the percentage composition of sodium (Na)?We'll begin by obtaining the molar mass of sodium hydrogen carbonate (NaHCO₃). This is shown below:
Molar mass of NaHCO₃ = 23 + 1 + 12 + (16 × 3) = 23 + 1 + 12 + 48 = 84 g/moleNext, we shall determine the mass of sodium, Na in NaHCO₃. Details below:
Mass of Na in NaHCO₃ = Na = 23 gFinally, we shall determine the percentage of sodium, Na in NaHCO₃. This is shown below:
Molar mass of NaHCO₃ = 84 g/moleMass of Na in NaHCO₃ = 23 gPercentage of Na = ?Percentage of Na = (mass of Na / mass of NaHCO₃) × 100
Percentage of Na = (23 / 84) × 100
Percentage of Na = 27.4%
Thus, the percentage of sodium, Na is 27.4% (Option C)
Learn more about percentage composition:
https://brainly.com/question/11952337
#SPJ1
calcium reacts with water to form calcium hydroxide and hydrogen. in the balanced equation for this reaction, what is the coefficient of hydrogen?
When calcium reacts with water to form calcium hydroxide and hydrogen in the balanced equation for this reaction, then the coefficient of hydrogen will be 1.
Calcium is a chemical element having symbol Ca and its atomic number will be 20. As an alkaline earth metal, calcium is a very reactive metal that forms a dark oxide-nitride layer when it is exposed to air. Its physical as well as chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth's crust, and the third most abundant metal, after iron and aluminum.
The balanced chemical equation for the reaction of calcium with water to form calcium hydroxide and hydrogen is:
Ca + 2H₂O → Ca(OH)₂ + H₂
In this equation, the coefficient of hydrogen (H₂) is 1.
To know more about calcium here
https://brainly.com/question/4023397
#SPJ4
The first people to attempt to explain why chemical changes occur were: A. metallurgists. B. the Greeks C. alchemists. D. physicists. E. physicians.
The Greeks made the first attempts to provide an explanation for why chemical changes take place.
Who made the initial effort to explain chemical changes?French chemist Joseph Proust was the first to suggest that substances have specific chemical formulas in the late 1700s. Proust conducted numerous tests and discovered that, regardless of how he got different elements to interact with oxygen, they always did so in specific ratios.
Who created chemical transformation?French chemist Antoine Lavoisier's work between 1772 and 1794 led to the first major advancement in the understanding of chemical processes. Mass was discovered to be conserved in chemical reactions by Lavoisier.
To know more about chemical changes visit :-
https://brainly.com/question/29760166
#SPJ4
ow much heat (in joules) must you add to the ice in order for you to melt all of it (the final situation will be all water at 0oc)?
167 J of heat we must add to the ice in order for us to melt all of the ice in it. Hence, the final situation results in water.
To calculate the amount of heat needed to melt all the ice, you first need to calculate the total amount of energy (in joules) required to melt the ice and convert it to water at 0°C. The formula for this is:
= Q
= m x ΔHf
where m is the mass of the ice (in kilograms) and
ΔHf is the heat of fusion of water (334 J/g).
Therefore, the total amount of energy (in joules) required to melt the ice and convert it to water at 0°C is:
= Q
= m x ΔHf
= m x 334 J/g
For example, if you have 0.5 kg of ice, the amount of energy required to melt it and convert it to water at 0°C is:
= Q
= 0.5 kg x 334 J/g
= 167 J
To know more about heat please refer: https://brainly.com/question/19383299
#SPJ4
suppose that a chemist combines 253 ml of methane and 891 ml of chlorine at stp in a 2.00 l flask. the flask is then allowed to stand at 298 k. if the reaction reaches 81.8% completion, what is the total pressure in the flask?
The total pressure in the flask is determined by the ideal gas law which is 4.00 atm.
This law states that the pressure of a gas is equal to its number of moles times its temperature divided by its volume. For this question, we need to calculate the number of moles of each gas before the reaction.
Methane has a molar mass of 16.04 g/mol,
so 253 mL of methane would be 1.106 moles.
Chlorine has a molar mass of 35.45 g/mol,
so 891 mL of chlorine would be 2.587 moles.
Thus, the total number of moles in the flask is 3.693.
Next, we need to calculate the number of moles that have reacted. 72.5% of the reaction has been completed, so 0.725 moles of the 3.693 moles have reacted.
Finally, the total pressure in the flask is equal to the number of moles times the temperature divided by the volume. This gives a pressure of 4.00 atm.
Learn more about pressure:
brainly.com/question/28012687
#SPJ4
when 0.551 g of sodium metal is added to an excess of hydrochloric acid, 5730 j of heat are produced. what is the enthalpy of the reaction as written?
The enthalpy of the reaction is 249.13 KJ when 0.551 g of sodium metal is added to an excess of hydrochloric acid and 5730 J of heat is produced.
According to the given question,
Weight of sodium metal = 0.551 g
We need to calculate the number of moles,
Using the formula of moles
Moles = given mass/molar mass
Moles = 0.551/23
Moles = 0.023
We need to calculate the energy in 1 mole
In 0.023 moles of sodium metal = 5730 J
In 1 mole of sodium metal = 5730/0.023
The energy in 1 mole of sodium is 249130.43 J
Hence, the enthalpy of the reaction is 249.13 KJ
To learn more about the enthalpy of the reaction visit here:
https://brainly.com/question/12972841
#SPJ4
in 2017 it was estimated that 47 per cent of Indians worked in the primary sector_mainly in agriculture. why was this sector the least important of the three in terms of outputs
Factors such as the lack of arable land and the scarcity of water make agriculture less productive in India.
Why does agriculture have the least output in India?India has a large area of degraded and infertile land, which limits the ability of farmers to produce crops. Soil degradation is caused by factors such as deforestation, overgrazing, and soil erosion.
India is facing an increasingly serious water shortage, which affects agriculture in many regions. Lack of access to water for irrigation is a major limiting factor for crop production.
Learn more about Agriculture in India:https://brainly.com/question/30095494
#SPJ1
determine the molality of a solution prepared by dissolving 4.11 g of potassium chloride in 64.3 g of water.
The molality of the solution is 0.064 mol/kg. Molality is defined as the number of moles of solute per kilogram of solvent.
To calculate molality, we need to first find the number of moles of solute (potassium chloride) and then divide it by the mass of solvent (water) in kilograms.
The number of moles of solute can be calculated using the formula: moles = mass/molar mass, where the molar mass of potassium chloride is 74.55 g/mol.
So, the number of moles of potassium chloride in the solution is: 4.11 g / 74.55 g/mol = 0.055 mol
The mass of water in kilograms can be calculated using the formula: mass in kg = mass in g / 1000 g/kg, where the mass of water in the solution is 64.3 g.
So, the mass of water in the solution is: 64.3 g / 1000 g/kg = 0.064 kg
Finally, the molality of the solution can be calculated using the formula: molality = moles of solute/mass of solvent in kg
So, the molality of the solution is: 0.055 mol / 0.064 kg = 0.064 mol/kg
Learn more about molality here:
https://brainly.com/question/24065939
#SPJ4