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Questions tagged [gas-laws]

Physical and chemical laws describing the properties and behavior of gases. This tag currently applies to properties and laws concerning both ideal and real gases.

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0answers
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Universal Gas Equation + Stoichiometry [on hold]

Could someone please solve the following questions for me? Use the universal gas equation to calculate the volume of the greenhouse gas, $\ce{CO2}$ (measured at $\pu{25°C}$ and $\pu{101.3 kPa}$), ...
0
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0answers
49 views

Behavior of molecules at absolute zero [on hold]

Can we say that at absolute zero temperature a gas like $\ce{CO2}$ will be separated into the constituent atoms and after that all of them will solidify devoid of any potential or kinetic energy as ...
2
votes
2answers
152 views

Entropy change of isothermal irreversible expansion of ideal gas [duplicate]

Two mole of an ideal gas is subjected to isothermal expansion from $\pu{2 atm}$ to $\pu{1 atm}$ at $\pu{300 K}$. Calculate entropy change of the system, surrounding and total, if the process is ...
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1answer
26 views

Real gas equation at high molar volume

How would the van der Waals equation of state look like when molar volume of gas is high? Does high molar volume correspond to low pressure? My textbook says that A real gas behaves similar to an ...
15
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4answers
3k views

How could the ideal gas law be discovered from experiments on real gases?

The gas laws, namely Boyle's Law, Charles' Law, Avogadro's Law and Gay-Lussac's Law, are all experimental laws. Combining these laws, we get the ideal gas law $pV=nRT$. Also, "real life" gases do not ...
2
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1answer
52 views

How to calculate the volume or mass of carbon dioxide gas absorbed by a calcium hydroxide solution?

Carbon dioxide reacts with calcium hydroxide as shown by the equation: $$\ce{Ca(OH)2 (aq) + CO2 (g) -> CaCO3 (s) + H2O (l)}$$ A solution containing $\pu{0.1 mol}$ of calcium hydroxide reacts ...
2
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1answer
40 views

Volume of air required to oxidize glucose

In the body, the oxidation of glucose is according to the reaction: $$\ce{C6H12O6 + 6 O2 -> 6 CO2 + 6 H2O}$$ Knowing that glucose consumption is $\pu{2.47 mol/d}$, What is the volume of ...
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1answer
20 views

Combination of several unit symbols when finding new pressure from ideal gas law

As a car is driven, the tires heat up and the volume and the pressure change. Calculate the new pressure of a 35.0 L tire initially at 235 kPa that expands to 36.5 L when it heats up from 15.0 °C to ...
2
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1answer
64 views

How to calculate the standard Gibbs energy at equilibrium?

Given that $K_c = 1.7 \times 10^{-13}$, calculate $\Delta G^{\circ}$ for this equilibrium mixture at $\pu{298 K}$. $$\ce{N2O (g) + \frac{1}{2}O2 (g) <=> 2 NO (g)}$$ I've calculated: $$ \...
1
vote
2answers
45 views

Finding percentage of the gas in a binary gaseous mixture of the given density

At STP, the density of a gas in a vessel is $0.9002$. If the gas is a mixture of argon and helium, what percentage of the gas is argon? I am stuck on this. From what I can gather, the only ...
0
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4answers
46 views

Adiabatic processes and the Ideal Gas Law [closed]

in my first year chemistry textbook it wrights that in adiabatic proccess when there is a system of canister filled with gas and a piston above(and wheights on it) if we let the piston move upward by ...
1
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1answer
42 views

Why is excluded volume in van der Waals equation divided by 2?

Source: Physics Stack Exchange The excluded volume calculated based on the diagram is 8 times the volume of a molecule. The volume is then divided by 2 to give the so-called excluded volume per ...
4
votes
1answer
90 views

Compressibility Factor Graph - Which gas attains a deeper minimum?

As in the given graph, how do I predict which curve among that of hydrogen, methane, and carbon dioxide attains a deeper absolute minimum? (greater deviation from Z=1). In fact, how do I make this ...
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0answers
39 views

Determining mole fraction of carbon dioxide knowing Kp only

I've been assigned the following problem at school: Given the following reaction: $$\ce{C (s) + CO2 (g) <=> 2 CO (g)}$$ Find the mole fraction of $\ce{CO2}$ provided that, in ...
0
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1answer
67 views

What is the radius of the atoms? [closed]

In a recipient there is an unknown monoatomic gas that occupies a volume of $\pu{230 cm3}$, at $\pu{300 K}$ and $\pu{1 atm}$. It is known that the atoms occupy a volume of $2\times10^{-4}$. Find the ...
1
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1answer
54 views

What is the temperature dependency of the van-der-Waals constants? [closed]

What is the effect of the temperature on the van-der-Waals constants $a$ and $b$? I have checked on the effect of pressure and volume on the van-der-Waals constants, but I've not been able to get the ...
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1answer
47 views

Equilibrium constant from mole ratio

Chapter 4, problem 13 from the Chemical Priciples [1, p. 170]: Equilibrium concentrations Experiments have shown that at $\pu{60 °C}$ and $\pu{1 atm}$ total pressure, the equilibrium ratio of $...
2
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1answer
64 views

Calculating volume of gases in different conditions

Doctor Who has a secret laboratory on Venus where atmospheric pressure is $92$ times that of Earth and room temperature is $\pu{735 K}$. There, Doctor Who mixes $\pu{4.00 g}$ of $\ce{CaCO3}$ with $\pu{...
2
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1answer
72 views

Calculating enthalpy change for a real gas

I know this question would be closed citing it to be a homework question. I posted it earlier also. But believe me I have tried it for myself before and that too many times but then couldn't arrive at ...
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votes
1answer
43 views

How does a gas occupy a fixed molar volume?

It is common knowledge that one mole of ideal gas occupies a volume of 22.41 L at standard temperature and pressure (0°C and 1 atm). However, this goes against the claim that gases don't have a fixed ...
0
votes
1answer
23 views

Why is STP mol/liter so specific? [duplicate]

How do we know that one mole of an ideal gas occupies (exactly) 22.4 Liters? Why is it so precise a value? Many other constants/conversions in science have multiple decimal places, so why is this ...
0
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2answers
71 views

Why do Gas Laws only use Kelvin Temperature? [closed]

I didn't see this in any other question, although it seems to be a fundamental question of the gas laws. I understand that Charles' Law practically has to use Kelvin temperature, because you would end ...
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votes
1answer
45 views

What does the volume of a gas depend on?

In my chemistry textbook, it states that the volume of a gas is directly proportional with the amount(number of moles) of that gas. However, it also mentioned before that the volume of a gas depends ...
0
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1answer
284 views

If temperature and volume are same, the pressure of gas obeying van der Waal's equation is smaller than that of an ideal gas"

Can you state the reasons for it. I think " It is smaller because mutual forces of attraction would resist the collision of particle and container".
0
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1answer
79 views

Can ideal gas law be applied to water vapour? [closed]

How to accurately estimate the molar concentration of pure water vapour at 298 K? Can ideal gas law be applied to water vapour to calculate the molar concentration?
1
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2answers
68 views

What's wrong with this gas law problem?

I recently took a chemistry test in which the following problem was offered: a 137 mL gas sample is collected over $H_2O$ at 753 mmHg and $22^oC$. What is the volume of the dry gas at STP if the ...
2
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0answers
42 views

Feasibility of application of Boyle's law in the case of varying number of moles [closed]

While reading up on ideal gases and the Boyle's law, I encountered a question in my textbook wherein a balloon was being filled with helium (assumed to be ideal) till it was just about to burst. The ...
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votes
1answer
39 views

Equalizing Pressure Question

I have a question about the gas collection over water lab: We learned that when the water level inside the graduated cylinder is higher than the outside water level, the gases inside the graduated ...
-1
votes
1answer
64 views

Calorific value of a gas in combustion

The Wikipedia article on heat of combustion says: The calorific value [...] may be expressed with the quantities: energy/mole of fuel energy/mass of fuel energy/volume of the fuel ...
2
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0answers
51 views

Comparing pressure and volumes of ideal and real gas

This question has been troubling me for quite a while now. Which has greater pressure: Real gas or an ideal gas under similar conditions? What about their volumes? I read this in many sources and ...
2
votes
1answer
100 views

Why do gases coexist as liquid and vapour?

I have having difficulty in understanding the liquefaction of gases.In the graph of isotherms of $\ce{CO2}$ I cannot understand how can gas coexist as liquid and vapour under area of $\mathrm{XCEBY}$....
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1answer
41 views

Why are moles used in the ideal gas law and not simply mass?

The crux of my question is, why is just the amount of particles included in $PV=nRT$ and there is nothing to account for the mass of the individual molecules? Or is mass accounted for in temperature, ...
0
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1answer
77 views

Interpreting straight lines in a graph of isotherms of carbon dioxide

I am having difficulty in understanding pressure-volume graphs of $\ce{CO2}$ at different temperatures which describes liquefaction of $\ce{CO2}$. I know that at the critical temperature of $\pu{31.1^...
2
votes
3answers
198 views

What is the term used as correction for attractive forces in the Van der Waals Equation?

I have seen a question in my textbook which is little bit confusing, The term that corrects for attractive forces present in real gas in van der Waal equation is (i) ${nb}$ (ii) $\frac{an^2}...
6
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1answer
638 views

Why do different gases have the same molar volume?

Molar volume: The molar volume, symbol $V_\mathrm m$ is the volume occupied by one mole of a substance (chemical element or chemical compound) at a given temperature and pressure. At S.T.P ...
0
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2answers
91 views

Doesn't the isothermal irreversible expansion/compression of an ideal gas law violate the ideal gas law? [closed]

Let's say a cylinder has some ideal gas. We use a piston to suddenly expand the gas in isothermal condition from $1\ \mathrm{atm}$, $20\ \mathrm L$ to $0.5\ \mathrm{atm}$, $50\ \mathrm L$. Since the ...
1
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1answer
45 views

Heat generation in exothermic reactions [duplicate]

Im thinking specifically of N2 + 3 H2 ⇌ 2 NH3. Its an exothermic reaction, therefore heat is generated. Im trying to understand how Chateliers principle interacts with this reaction. I understand that ...
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1answer
1k views

What percentage of a 20 volume solution is actually hydrogen peroxide? [closed]

Not too sure how to go about answering this question. I know that volume Strength is the volumes of O2 released on the decomposition of one volume of H2O2 at STP. However, I'm not certain where to go ...
0
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1answer
54 views

Сould you tell me, Henry's law depends on curvature of gas/liquid interface or not?

Could you tell me Henry's law depends on curvature of gas/liquid interface or not? It would be better with references. Thank you!
2
votes
0answers
44 views

How was it possible to accurately measure the mass of gases in the 19th century?

I have seen periodic tables of Mendeleev (1834-1907) and Newland (1837-1898) in which masses of gases such as oxygen and nitrogen were shown. I don't think there were instruments to measure mass of ...
0
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0answers
50 views

Stoichiometry question regarding Kp and amount

$$\ce{2 NH3 (g) -> N2 (g) + 3 H2 (g)}$$ I know the reaction, temperature (600 Celsius), pressure (1 bar), $K_p$ (equilibrium constant regarding pressure)=16,76, and initial $mol_{reactant}$=1 mol. ...
1
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1answer
756 views

Final pressure of an ideal gas mixture, when two separate gases are put into one vessel

At constant of 200 cm³ of $\ce{N2}$ at 720 mmHg and 400 cm³ of $\ce{O2}$ at 750 mmHg are put together into one litre flask. The final pressure of the mixture is: My question is how to use ideal gas ...
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votes
1answer
58 views

Is there a better model than the Kinetic Theory of Gases [closed]

I'm looking for a better relationship between the Kinetic energy of a gas and it's Temperature, and also how they vary with gravity (not altitude, just gravity!). So is there a model better than the ...
0
votes
0answers
30 views

Is this the equation of state?

\begin{align} pn^{-\lambda} &= \text{constant} \tag1\label{eq:one}\\ pV^\lambda &= \text{constant} \tag{2, adiabatic equation} \label{eq:two}\\ n\left(\frac{l}{2}\right)\delta T &=...
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1answer
418 views

Dissolving of non polar gases in water (liquid)

How does dissolving happen for non polar gases in water? Is it like being in the space between the water molecules or does there occur some kind of interaction occur between gas molecules and water ...
0
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0answers
34 views

Total pressure conservation during equilibrium reaction

I tried to solve the following exercise but my solution is different from the one of the book and I can't understand why. The exercise is the following: With total pressure $$p_\text{tot}=\pu{0.5 ...
43
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1answer
6k views

Why can we still breathe in valleys? [duplicate]

Air is 1% argon. Argon is heavier than air. Why doesn't the argon concentrate in low-lying areas, choking out life there?
0
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1answer
32 views

Measure of partial pressure on blood

Here is the issue of blood gases partial pressure. On medical reports is common to see partial pressure of gas on blood, usually oxygen, but there is no gas in equilibrium with blood, so it is ...
1
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2answers
91 views

Volume of composition of air

My teacher stated: At standard conditions, 1 liter of air at 21% oxygen possesses $\pu{0.21 L}$ of oxygen. Since at STP, 1 mole of gas occupies $\pu{22.4 L}$, simply divide $0.21/22.4$, to arrive ...
0
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0answers
21 views

Gas concentrations along the gradient from sea level to deep-sea

Studying scuba diving-related phenomenas I thought about how to estimate gases concentration down the sea. Of course, solubility of gases at, for example, $5$ atm of pressure, can be estimated with ...