Temperature changes in sleeping bag is the dependent (outcome) variable in her experiment.
What are the types of variables in experiment ?Variables are the major manipulating factor which is compulsorily added to the experiment in order to get accurate results like person's eye color, its value can change from brown to blue depending on different factors.
An independent variable can not change by the presence of other factor where as dependent variable depend on other variable and can be influenced by other components.
Control variables are the constant which only determine the accuracy of the experimental result and prevent bias from the experiment.
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Sample of krypton gas occupies 75.0 mL at 0.400 atm. If the temp remained constant, what volume would the krypton occupy at A. 4.00 atm; B. 0.0400 atm; C. 765 torr; D. 4.00 torr; E. 3.50x10^-2 torr?
The correct answer for volume would the krypton occupy are 29.8 mL , 5375 mL , 6.5 * 10^ 5 mL .
We can solve this problem by using Boyle's Law, which states that:
"For a fixed mass of an ideal gas kept at constant temperature, the pressure
of the gas is inversely proportional to its volume"
Mathematically:
pV = const. where
p is the pressure of the gas
V is its volume
We can rewrite the formula as
PiVi = P2V2
For the gas in this problem:
P=0.400atm is the initial pressure
Vi 75.0mL is the initial volume
765mm Hg 1.006am is the final pressure (using the conversion factor
1atm = 760atm )
Solving for V2, we find the final volume:
V 2 =p1vi/ p2 =(0.400) (75.0)/ 1.006 = 29.8mL
We can solve this part by using again the equation:
Where in this case we have:
p 1= 0.400at is the initial pressure
V_{1} = 75mL is the initial volume
p_{2} = 4, nm*H_{0} is the final pressure
Converting into atmospheres,
p_{2} = 4 Hg 7mm/d -0.00536m
And solving for V2, we find the final volume:
V_{2} = (p_{1}*V_{1})/p_{2} = ((0.4)(75))/0.0056 = 5357mL
e)
As before, we use Boyles' Law:
p{1}*V{1} = p{2}*V{2}
In this part we have:
p{1} = 0.4atm is the initial pressure of the gas
V{1} = 75mL is the initial volume of the gas
p{2} = 3.5 * 10 ^ - 2 torr
1 torr is equivalent to 1 mmHg, so the conversion factor is the same as before.
therefore the final pressure in atmospheres is:
p2=3.50 *10^-2 2mm Hg 760mmHg/atm 4.6-10-atm
And so, the final volume of the krypton gas is:
V{2} = (p{1}V{1})/p{2} = ((0.4)(75))/(4.6 * 10 ^ - 5) = 6.5 * 10 ^ 5 * mL.
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Step 3.
Drag lone pairs of electrons to each terminal atom until each has an octet of electrons, or until all electrons are used. You may remove a lone pair by clicking on it. Check your answer.
There is a double bond between the carbon atoms and a lone pair on oxygen.
What is Lewis structure?The term Lewis structure has to do with the structure that shows the arrangement of atoms in a compound. It is normal that the structure would be composed of the symbols of the elements and the bonds that they form as dots or sometimes as a single line to show shared electrons.
Now we can see that the compound C2H2O is a compound that contains a double bond between the carbon atoms. There is a lone pair of electron that resides on the oxygen atom. The structure of this compound is shown in the image attached.
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Determine the type of investigation.
How does an iPod receive messages?
comparative
none is correct
experimental
descriptive
Answer:
comparative
Explanation:
The massage just pop on the ipod
What is concentration of N2O5 in the following first order reaction in which the rate is 2.4*10^-5 mole/L and rate constant is 3 * 10 ^ - 5 * S ^ - 1 ?
0.8mole/L is concentration of N2O5.
As the reaction is first order ,
so the order with respect to N2O5 is 1.
general,
Rate of equation is written as
rate = k [N2O5]^1
k is the rate constant = 3 * 10 ^ - 5 * S ^ - 1
rate = 2.4*10^-5 mole/L
N2O5 is concentration term
2.4*10^-5 mole/L = 3 * 10 ^ - 5 * S ^ - 1 [ N2O5]
N2O5 = [0.8 mole/L]
=0.8mole/L
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The data table below shows the yield of vegetables in a school's garden for three years. The yield is the number of pounds of vegetables harvested. The same number of each type of vegetable was planted every year
The correct option is (d) ,i.e., the acorn squash yield lessen from 2012 to 2013 due to lower temperatures.
To estimate yield of vegetables in a harmonious manner, one can gather 10' of row at several locales in the field. Multiply the average yield( lb) per 10' of row times the following row distance factors to convert the sample of yields of vegetables to lb/A.
The question is incomplete the given questions is a multiple choice question :
The data table shows the yield of vegetables in a garden of the school for 3 years. The yield is the number of pounds of vegetables gathered. The same number of each type of vegetable was planted every time. Which statement is an inference?
a. the onion yield was higher than the beet yield in 2013
b. the butternut squash yield lessened from 2011-2012
c. the spinach yield was 102 pounds in 2011 and 137 pounds in 2012
d. the acorn squash yield lessen from 2012 to 2013 due to lower temperatures
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What is the chemical equation for frying an egg
The given chemical reaction is :
Calcium Oxide (s) + Water (l) → Calcium Hydroxide (s)
Molecular Changes : A chemical reaction is one in which the replying substances experience changes at the molecular position. This means that bonds between tittles of the reactants are broken, and tittles are changed or rearranged to produce commodity new. Chemical reaction can be reversible or unrecoverable.
What happens when frying an egg ?
Frying an egg is a chemical response. It's an illustration of an endothermic response or bone that takes in heat to make the response do. An egg is made up of proteins and water, and the thralldom also contains fat. When an egg is hotted , the proteins begin to change their structure. Protein motes are veritably complex, made up of long chains of structure blocks called amino acids. These chains are also folded and twisted to make complicated molecular structures. Hotting the egg adds energy, which causes the motes to begin to move and lose their shape. Bonds holding the shape of the protein motes together begin to break, unfolding the proteins and allowing them to spread out. New bonds are formed, and water evaporates out of the egg, changing it into a semi-solid. The egg has experienced anon-reversible chemical response, as it can not be changed back into its raw state.
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Calculate the ratio of the mass ratio of S to O in SO to the mass ratio of S to O in SO2 . Consider a sample of SO in which the mass of S = 32 g and the mass of O = 16 g . Assume that in SO2 that there is also 32 g of S .
The correct answer is The mass ratio of S to O in SO divided by the mass ratio of S to O in SO2 is 2 :1.
When two elements can combine to form two or more different compounds, the mass of one element compared to the fixed mass of the other will always be in a ratio of small whole numbers.
As we all know,
Oxygen mass = 16 g
Sulfur mass = 32 g
Sulfur mass in SO = 32 g
The mass of oxygen in SO is 16 g.
Sulfur to oxygen mass ratio in SO =..... (1)
Sulfur mass in SO2 = 32 g
Oxygen mass in SO2 = (2 16)g = 32 g
Sulfur to oxygen mass ratio in SO2 =..... (1)
The S/O ratio in SO is 2: 1.
The S/O ratio in SO2 is 1: 1.
Taking the ratios 1 and 2, we get:
the mass ratio of S to O in SO to mass ratio of S to O in SO2 is 2 : 1
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If the bond length in a XY molecule is 212,
what will be the covalent radius of atom X, if
the covalent radius of Y atom is 93.
O
119
2.27
128
3
Answer:
The correct answer is 119.
Explanation:
We are given the bond length of XY is 212.
The covalent radius of Y = 93.
Now this means that the bond length(R) is sum of the radio of X and Y Atom.
So, R(XY)=r(X)+r(Y)
212 = r(X)+93
r(X)= 119.
Therefore, the covalent radius of X is 119.
I hope this helps, have a good day! :D
Bond length is the distance between two bonded atoms. The covalent radius of X in XY molecule with bond length 212 and Y with a covalent radius of 93, is 119.
What is covalent radius?Covalent radius is the measure of the atomic size bonded with another atom through covalent bond. Covalent bonds are formed between non-metals with comparable electronegativities.
Bond length of molecule is the distance between the two bonded atom. Mathematically bond length of a covalent compound is the sum of covalent radius of the two bonded atoms.
The bond length of the molecule XY is given as 212 and the covalent radius of Y atom is 93. The bond length 212 is the sum of covalent radius of Y and covalent radius of X.
Covalent radius of X = 212 - 93 = 119.
Therefore, covalent radius of X atom in the XY molecule with bond length 212 and Y atom with covalent radius of 93 is 119 thus, option a is correct.
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A typical aspirin tablet contains 321 mg of the active ingredient acetylsalicylic acid. convert to grams
A typical aspirin tablet contains 321 mg of the active ingredient acetylsalicylic acid and 321 mg makes 0.321 g.
Define Aspirin.The nonsteroidal anti-inflammatory medicine (NSAID) aspirin, often referred to as acetylsalicylic acid (ASA), is used to treat a variety of inflammatory disorders by lowering pain, fever, and/or inflammation. These conditions include Kawasaki disease, pericarditis, and rheumatic fever.
Long-term usage of aspirin is also used to help those at high risk avoid further heart attacks, ischemic strokes, and blood clots. Effects of pain or fever often start within 30 minutes. Aspirin functions similarly to other NSAIDs but also inhibits platelet function.
What risks does aspirin pose?Your doctor should be consulted when deciding whether or not to take aspirin because it depends on your cardiovascular risk, according to Wong. While aspirin is often taken safely by many people, it can also result in life-threatening stomach, intestinal, and brain bleeding.
convert mg to gram1 mg = 1/1000 g
so,
321 mg = 321/ 1000g
= 0.321g
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The density of air is 1.29 grams/Litre. What is the weight, in kilograms of a cubic metre (1.00 m^3) of air?
The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is 1.29 kg
How can you calculate the density of humid air?Humid air's density can be calculated by treating it as a mixture of ideal gases. The vapour pressure is the partial pressure of water vapour in this case. In the temperature range of 10 °C to 50 °C, the density calculation error is less than 0.2% using this method.
given that
Density =mass/ volume
1.29grams/ liter =[tex]\frac{mass}{m^{3} }[/tex]
1 liter = 0.001 [tex]m^{3}[/tex] and 1 kilogram = 0.001grams
0.00129 kg/[tex]m^{3}[/tex] = mass / 0.001 [tex]m^{3}[/tex]
mass =0.00129 kg/[tex]m^{3}[/tex] /0.001 [tex]m^{3}[/tex]
which means,
mass= 1.29 kg
The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is 1.29 kg
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PLEASE HELP
Claim: Write a Claim statement
How does the abundance(amount) of each isotope affect the average atomic mass of a mixture of atoms of the same element?
The average atomic mass of a mixture of atoms of the same element will...
The abundance(amount) of each isotope determines the relative atomic mass.
What is the relative atomic mass?The relative atomic mass refers to the mass of the atom that is obtained by adding together the products of the relative atomic masses of each isotope and the relative abundance of the isotope.
Hence, we can say that, since the relative atomic mass takes into account the masses and percentage abundance of all the isotopes, it then follows that the abundance(amount) of each isotope determines the relative atomic mass.
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The amount of heat absorbed by the calorimeter in this reaction must be determined before you can calculate the enthalpy of the reaction that occurs inside of it.
To do this, suppose that you measure exactly 43.5 mL of cool water at 22.0°C and
place it into a calorimeter. Then you add 21.0 mL of warm water (initial temperature
of 37.0°C) to the calorimeter. The final temperature of the entire system is 25.5°C.
Compute the heat capacity of the calorimeter in J K–1 assuming that no heat leaks
into or out of the calorimeter.
The heat capacity of the calorimeter is 16.8 J/K.
What is the heat capacity of the calorimeter?Now we know that the calorimeter is a device from which there is no heat loss or gain. In this case, the heat lost by the hot water is equal to the heat gained by the calorimeter.
Thus;
cwθ = ccθ
Where;
cc= heat capacity of the calorimeter
cw = heat capacity of water
θ == temperature change
Hence;
4.2 * (37 - 25) = cc (25 - 22)
cc = 4.2 * (37 - 25)/(25 - 22)
cc = 16.8 J/K
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how many moles are present in 1.0 m3 O2 at STP
Answer:
Explanation:0.089mol
at STP 22.4l of any ideal gas is the volume of one mole which means the number of moles in 02 is222.4=0.089.
If you have a sample of 3.5 × 1022 atoms of tin (Sn), how many moles of tin do you have?
The correct answer according to the text is 0.058 mol Sn but no matter how I work it, I get 5.8 X 10^-2 mol Sn. I am using a scientific calculator. How did they get that answer?
The number of mole of tin (Sn) that you have is 0.058 mole
Avogadro's hypothesis6.02×10²³ atoms = 1 mole of tin (Sn)
With the above information, we can obtain the number of mole ot tin. Details below
How to determine the mole of tin that contains 3.5×10²² atomsWe can obtain the number of mole of tin as follow:
6.02×10²³ atoms = 1 mole of tin (Sn)
Therefore,
3.5×10²² atoms = (3.5×10²² atoms × 1 mole) / 6.02×10²³ atoms
3.5×10²² atoms = 0.058 mole of tin (Sn)
Thus, the number of mole of tin (Sn) you have is 0.058 mole
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Can somebody please help me
Answer:
A.
Explanation:
Spiders are creepy.
That your answer.
1. (1 point) The Sherlock Holmes story, the Sign of the Four, involves the Great Mogul
diamond. Before cutting, its weight was 787 carats. 1 carat = 0.200 gram. Assume that
the diamond is pure carbon. Calculate the number of moles of carbon in the uncut Great
Mogul diamond. Also calculate the number of carbon atoms.
no. of moles in uncut diamond are 13.11 mol and number of Carbon atoms are 78.94 × 10^23.
The atoms of diamond are grouped in a crystal structure known as diamond cubic, and it is a solid form of the element carbon. The chemically stable form of carbon is another solid form of carbon known as graphite at ambient temperature and pressure, but diamond transforms to it very slowly.We are aware that a mole is a unit of measurement for a substance that contains precisely the same number of atoms as 12 g of C12.The mass of a substance is given in this case. We are aware that the diamond is Carbon's allotrope.
weight of diamond before cutting = 787 carats
1 carat. = 0.200 gram
therefore, 787 carats. = 787 × 0.200
= 157.4 gram
To calculate the number of moles equation is
Number of moles =Mass / Molar mass
Molar mass of carbon Is 12g/mol
therefore, no. of moles = 157.4 / 12 = 13.11 mol
We know that 1 mol of any substance contains 6.022×10^23 atoms.
Here we have 13.11 mol of carbon. thus,
No. of Carbon atoms = 13.11 × (6.022×10^23 / 1 mol) = 78.94 × 10^23
Thus, 13.11 mol of diamond contain 78.94 × 10^23 number of Carbon atoms.
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A pediatric patient with a body mass of 75 pounds is prescribed Rohypnol for arrhythmia. The recommended dose is 3 mg per kilogram per day given in divided doses every six hours how many milligrams of propanol should be given for each dose
The milligrams of propanol should be given for each dose is 101.25 mg.
How much should be given for each dose?We know that drug is a chemical that is taken into the body to achieve a particular end which is to stop sickness. The amount at which drug should be given is called the dose of the drug.
The mass of the patient is 75 pounds we have to convert this weight to kilograms.
1 pound = 0.45 Kg
75 pounds = 75 pounds * 0.45 Kg/1 pound
= 33.75 Kg
If the dose is 3 mg per kilogram then;
3 mg should be given for 1 kilogram of body mass
x mg should be given for 33.75 Kg of body mass
x = 3 mg * 33.75 Kg / 1 kilogram
= 101.25 mg
Hence, milligrams of propanol should be given for each dose is 101.25 mg.
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2013 Cengage Learning
3. A student measured the dimensions of a table and recorded the length as 103.50 cm and the width
as 73.75 cm. According to the student's calculator, the area is 7633.125 cm². What value should the
student report as the area? Explain your answer.
Dimensions of a table and recorded the length as 103.50 cm and the width
as 73.75 cm
AREA = L × B
AREA = 103.50 × 73.75
area = 7,633.125 cm²
but the student should report 7633 cm² because the width measurement (73.75 cm) has 4 significant figures while the length measurement (103.50 cm) has 5 significant figures and when multiplying the answer should have the same number of significant figures as the number with the least number of sig figs.
Significant Figures can help determine the accuracy of a number by the number of significant figures it contains.so the correct answer should be 7633 cm².
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This is an impossible formula. Pretend it is real.
If you had 1 mol of Cr8(PO4)3 how many moles of Cr would there be?
Remember that you should never include a 1 as a subscript but for the sake of clarity for this problem you may see a 1 as a subscript.
Fe = 52.00 g/mol
P = 30.97 g/mol
O = 16.00 g/mol
Make sure your answer includes TWO decimal places.
The number of mole of Cr in 1 mole of Cr₈(PO₄)₃ is 8.00 moles
Description of Cr₈(PO₄)₃From the formula of the compound, Cr₈(PO₄)₃, the following were obtained:
8 moles of Cr3 moles of P12 moles of OHow to determine the number of mole of Cr in 1 mole of Cr₈(PO₄)₃From the formula, we can see that 8 moles of Cr are present.
Thus, 1 mole of Cr₈(PO₄)₃ will contain = 1 × 8 = 8.00 moles of Cr
Therefore, we can conclude that 1 mole of Cr₈(PO₄)₃ contains 8.00 moles of Cr
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how light behaves as it relates to its nature (waves or particles).
Light travels as
and interacts with matter as
Light travels as a "wave" and interacts with matter as a "particle".
Electromagnetic radiation that the human eye can detect as light. From radio waves with wavelengths measured in metres to gamma rays with wavelengths shorter than roughly 1 1011 metres, electromagnetic radiation occurs throughout a very broad range of wavelengths. The wavelengths of light that are visible to humans fall into a very small range within that wide spectrum, ranging from about 700 nanometers (nm; billionths of a metre) for the red light to roughly 400 nm for violet light.
Infrared and ultraviolet are two spectral bands that are close to the visible band and are frequently referred to as light as well. A fundamental physics constant, the speed of light in a vacuum is currently accepted to be 299,792,458 metres per second.
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What new combined branch of study was developed from the
study of matter within living systems?
According to the research, the correct option is Biochemistry. It is a new combined branch of study that was developed from the study of matter within living systems.
What is Biochemistry?It is an integrating science or scientific discipline that studies at the molecular level the characteristics and functions of the chemical components of living beings.
In this sense, it is responsible for the study of substances such as proteins, lipids, carbohydrates that are present in living organisms and the fundamental chemical reactions for vital processes.
Therefore, we can conclude that according to the research, the correct option is Biochemistry. It is a new combined branch of study that was developed from the study of matter within living systems.
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Write an equation that shows the formation of the bromide ion from a neutral bromine atom.
The equation that shows the formation of the bromide ion from a neutral bromine atom is as follows: Br + e- → Br-
What is an ion?Ion is the atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.
An atom becomes an ion when it loses or gains electrons.
According to this question, bromine atom is neutrally charged but quicky becomes charged into an ion when it gains one electron. The equation is represented as follows:
Br + e- → Br-
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how can we apply our knowledge about matter in our lives]
Answer:
The answer is
Explanation:
by studying the matter and its parts and also discovering the wonders of our earth
How many moles water contain 1.51x10^24 molecules of water
2.507 moles of water is present in 1.51 x 10^24 molecules of water
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12
Every mole contain a certain number of atoms which is the Avogadro's number
Avogadro's number states that each mole of every compound contains
6.023x 10^23 atoms of molecules
It is given to us to find out how many moles of water is present in 1.51 x 10^24
The number of moles of water present = 1.51 x 10^24 / 6.023 x 10^23
=2.507 moles
Hence, 2.507 moles of water is present in 1.51 x 10^24 molecules of water
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What are the characteristics of a metallic bond?
A. Electrons are shared unequally between two atoms.
B. Electrons move freely among positively charged ions.
C. Electrons are shared equally between two atoms.
OD. Electrons are transferred from one atom to another.
Answer: my answer would be a
Explanation: so i did some research and all of it came up with the answer (A).
10) A graduated cylinder has a mass of 50 g when empty. When 30 mL of water is added, the graduated
cylinder has a mass of 120 g. If a rock is added to the graduated cylinder, the water level rises to 75
mL and the total mass is now 250 g. What is the density of the rock?
M=
V=
D=
The rock would weigh 2.89 grams per milliliter.
It is the mass of anything or body per unit volume of that specific object or body.
Equals volume / mass
A graduated cylinder has a mass of 50g when empty, as stated in the problem. The graduated cylinder has a mass of 120g after 30 mL of water have been added.
The rock weighs 250 grams, or 130 grams.
the rock's volume is equal to 75 milliliters minus 30 milliliters, or 45 milliliters.
Mass of the rock divided by volume equals 2.89 grams per milliliter, which is the density of the rock.
As a result, the rock has a density of 2.89 grams per milliliter.
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Hydrogen has one electron, helium has two electrons, and lithium has three electrons. Hydrogen and lithium are both reactive, but helium is unreactive. How could the quantum mechanical model of the atom explain this pattern of behavior?
The valence shell of an atom if completed octet or the maximum number of electrons it can fill then it will be stable. Helium is not reactive because it is highly stable and its valence shell is fully filled.
What is helium?Helium, is the second element in the periodic positioned in the noble gas group. It have an electronic configuration of K=2. The only orbital it have is K and it is completely filled. That's why it is stable.
According to quantum mechanical model of atom, each orbital have a certain capacity to accommodate electrons and an orbital is considered as a wavefunction.
When the valence orbitals fulfill the electrons, then the atom is no longer need an electron or never donate from the completely filled state. Hence it becomes unreactive.
The valence shell of hydrogen and lithium is not completely filled and they are reactive to gain electron to attain stability. Therefore, helium is unreactive because of its stability.
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100 Points!
A student reacted 0.3000 grams of aluminum with oxygen gas and obtained 0.5333 grams of aluminum oxide. Based upon the experimental data, determine the experimental empirical formula of this aluminum oxide.
Answer:
Empirical Formula = Al3O4 .
Explanation:
Mass of Aluminium = 0.3000 g
Mass of Oxygen in oxide = 0.5333 g - 0.3000 g = 0.2333 g
Moles of Aluminium = Mass / MOlar Mass = 0.3000 g / 27 g = 0.01112 moles
Moles of Oxygen = Mass / Molar Mass =0.2333 g / 16 g = 0.01458 moles
Now we will divide each of the molar quantities by the smallest number of moles.
Aluminium : 0.01112 moles / 0.01112 moles = 1
Oxygen : 0.01458 moles/ 0.01112 moles =1.31
Since, the ratio between Al and O is 1:1.31 which is not the smallest whole numebr ratio. SO, we will multiply it by the smallest number to get whole number ratios.
So, Here on multiplying the ratio by 3 ,we get Al : O = 3:4.
The experimental empirical formula of the aluminum oxide is Al₂O₃.
To determine the empirical formula of the aluminum oxide, we need to calculate the mole ratios of aluminum (Al) and oxygen (O) based on the given masses.
Convert the masses of aluminum and aluminum oxide to moles:
Aluminum: 0.3000 grams Al * (1 mole Al / molar mass of Al) = X moles AlAluminum oxide: 0.5333 grams Al₂O₃ * (1 mole Al₂O₃ / molar mass of Al₂O₃) = Y moles Al₂O₃Determine the mole ratio of Al to Al₂O₃:
Divide the number of moles of Al by the number of moles of Al₂O₃: X moles Al / Y moles Al₂O₃ = ZSimplify the mole ratio to obtain the empirical formula:
If Z is close to a whole number or a simple ratio (e.g., 1:1, 2:1, 3:1), we can assume the empirical formula is Al₂O₃. In this case, we have assumed that the experimental data is consistent with the empirical formula Al₂O₃.It is important to note that the given experimental data and the resulting empirical formula are based on the assumption that the reaction went to completion and that the measurements were accurate. Further confirmation and analysis, such as using additional experimental techniques or calculations, may be necessary to verify the empirical formula.
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the physical properties of minerals result from their ____?
Answer: Internalized Crystal Structure
Explanation:
"The exact and unique arrangement of atoms, ions or ionic groups is the characteristic feature of each crystallized mineral."
- S.K. Haldar & Josip Tisljar, authors of Mineralogy and Petrology
A mineral's unique and specific crystal structure determines the physical properties such as color, hardness, density, luster, crystal form, cleavage and fracture.
A car is traveling 65.0 miles per hour. Convert this to meters per second.
Answer:
29.0576
Explanation:
To convert miles per hour to meters per second you divide the speed value by 2.237.