Physical and chemical laws describing the properties and behavior of gases.

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Addition of inert gas to equilibrium mixture under constant pressure [duplicate]

Adding inert gas under constant volume will not disturb equilibrium. But I want to know what would happen if inert gases are added at constant pressure. If total pressure remains constant and inert ...
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43 views

At what point does Avogadro's law not apply?

A mole of hydrogen gas takes up 22.4 L, but so does a larger molecule like $\ce{CO2}$. Methane ($\ce{CH4}$) is an even larger sized molecule, but a mole of it will still take up 22.4 L. I would assume ...
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45 views

How much does a light heat the air around it?

My dad told me to turn off the lights when I'm not using them because it will keep the house cooler. I don't think he is correct that a light can heat up the room. How much of a difference in the ...
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43 views

Ideal among the given gases

Which one among the following shows maximum ideal behaviour? $\ce{NH3}$ $\ce{HCl}$ $\ce{Rn}$ $\ce{H2O}$ Ammonia and water have hydrogen bonding so they're ruled out. That leaves ...
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Why don't gases escape Earth's atmosphere?

Some gases are lighter than others and rise. Why don't they continue going up, leave the atmosphere, and then enter outer space?
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Misconception? “That gas is heavier so it sinks.”

I've heard people say many times that one gas is heavier than the other so the heavier gas sinks. Now this must certainly be true to a certain extent (I think of gas used in WWI that sunk into ...
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The density of Nitrogen at 0 degrees Celsius and 1 atmosphere is most nearly equal to which of the following quantities?

The density of nitrogen at 0 degrees Celsius and 1 atmosphere is most nearly equal to which of the following quantities? a) 0.001 g/L b) 0.01 g/L c) 0.1 g/L d) 1 g/L e>) 10 ...
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biochemistry questions need help [closed]

Suppose 15.2 g of $\ce{O2}$ gas was compressed into a 1.50 L steel cylinder at a temperature of 38.0 °C. What pressure in atm would the gas exert on the walls of the cylinder?
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What are analytical expressions for the isothermal change of Gibbs energy?

The change of Gibbs energy at constant temperature and species numbers, $\Delta G$, is given by an integral $\int_{p_1}^{p_2}V\,{\mathrm d}p$. For the ideal gas law, $p\,V=n\,RT$, this comes down to ...
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505 views

Ideal Gas Equation Contradiction [duplicate]

You have a regular balloon, and you decide to heat it up. The gas particles inside the balloon will gain kinetic energy, and so, the gaseous particles will collide with the internal wall of the ...
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146 views

How can I light a fire in this case?

Is there any gas that contains oxygen so that it doesn't require oxygen from the environment in order to burn? What I am trying to do is use LPG gas, which is fed through a pipe to a burner that is ...
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23 views

Nitrogen and an unknown gas is leaked into a common vessel… The gaseous mixture contains 0.4 moles of nitrogen. Molecular mass of the other gas is?

For 10 minutes each, from two identical holes, nitrogen and an unknown gas is leaked into a common vessel of 3L capacity at 300K. The resulting pressure is 4.15 bar. If the gaseous mixture contains ...
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46 views

What fraction of air does elapse upon heating an empty flask?

A student forgot to add the reaction mixture to the round bottomed flask at 27 °C but instead he placed the flask on the flame. After a lapse of time he realised his mistake and using a pyrometer ...
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65 views

Deviation of real gases from ideal behaviour

From the Amagat's curve we can see two types of result for real gases. If we increase pressure,the value of $PV$ decreases initially and then the value starts increasing for the gases like- carbon ...
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463 views

Why not an Avogadro's principle for solid matter?

Avogadro stated that for any ideal gas, 1 mole of particles will occupy a specific volume at a specific ratio of pressure and temperature. So why doesn't this apply to a liquid or solid?
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553 views

What is the state of aggregation (gas, liquid) of oxygen in blood?

Atmospheric oxygen is in O2 and a gas. Then we inhale the air, our efficient lungs do the magic to filter out the oxygen and push them into the blood stream. When we say hemo and globin transport the ...
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21 views

what is the relation between partial pressure and vapour pressure? [duplicate]

I've read about Raoult's Law, and Henry's Law. So I wanted to know whether there is any relation between partial pressure and vapour pressure? As partial pressure is directly proportional to the mole ...
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35 views

What are the possible changes that might occur if I add an inert gas to a chamber containing another few different gases?

As an example, let's assume that we have a gas $\ce{P(g)}$ inside a chamber and when the temperature inside it increases to a certain value there is an equilibrium that prevails inside the system. So ...
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Are there non-transparent gases?

Are there gases that are not transparent at room temperature (i.e. at temperature below the point where the substance starts to radiate visible light due to heating)?
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How to calculate the equilibrium pressure when ammonia and hydrogen gasses react in a closed system?

There is a container that has a volume of $5~\mathrm{L}$ on one side and $3~\mathrm{L}$ on the other and is separated in the middle. There are $2~\mathrm{mol}$ of $\ce{N2}$ on one side at ...
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1answer
95 views

Determine balloon diameter needed to lift a 7lb cat with various gases

My question is regarding setting up this equation. The givens are as follows: Gases are helium, methane and hydrogen. (Test all three) Assume balloon is spherical. Assume temperature is ...
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Perplexing claim in Chang and Overby's “General Chemistry”

I'm reading the chapter on gases in Chang/Overby's book "General Chemistry: The Essential Concepts", and the following passage is causing me some confusion: I don't quite understand the underlined ...
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1answer
39 views

How to determine at temperature and pressure to keep Cl2 a gas?

I have chlorine tanks and they will be used industrially. When I use them, they will be exposed to all sorts of varying temperatures. I was wondering if there was any way that when I use them, I could ...
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770 views

When I heat up a balloon, does the air inside increase in pressure as well as volume?

When I heat up a balloon, does the air inside the balloon increase in pressure as well as volume? I thought pressure and volume were inversely proportional? Or does pressure and volume increase as ...
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83 views

Entropy increase when heating a gas

What is the entropy change when the temperature of 1.00 mol of ideal gas is raised reversibly from 10 °C to 50 °C at constant pressure, constant volume, and assuming the heat capacity is independent ...
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298 views

Why do some gases liquefy easily under pressure and normal room temperature?

Is this a combination of Boyle's and Charles' Laws or simply one of them? I'm confused as to which applies. I don't feel I fully understand the implications of both laws individually and I'm ...
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47 views

Expansion of a gas, calculating new volume

Hi I was reading this while studying for an exam and wondered how you would go about calculating it, I’m a bit confused. $\mathrm{5~mol}$ of a gas is confined in a piston (volume $\mathrm{100~cm^3}$) ...
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75 views

Intensive and extensive properties of gases

Every chemistry textbook I have ever seen defines intensive and extensive properties the same way: Intensive properties are those which do not depend on how much matter is present, while extensive ...
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93 views

Clarifying Density of a Mixture Concepts [closed]

How do you find density of a mixture of 2 or more gases? What info would be needed?
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103 views

Endothermic Conversion of Liquid to Gas

When a liquid (in my case I used butane) under high pressure is released into the air, it becomes gaseous, and the container seems to get colder. Why is it that turning a liquid to a gas requires ...
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86 views

Calculate the final pressure, the composition of the mixture, and the partial pressures of the components?

A tank contains methane at 1000 psia and 140 F. Another tank of equal volume contains ethane at 500 psia and 140 F. The two tanks are connected, the gases are allowed to mix, and the temperature is ...
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40 views

How do I calculate the new volume of an ideal gas upon temperature change [closed]

The problem asks a gas temperature of 14 degrees C, and a volume of 4.5L. If the Temperature is raised to 29 degrees C and the pressure is not changed, what is the new volume of the gas? The ...
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How does composition of air affect vapor saturation limit?

Suppose we hold temperature, pressure, and gas composition (say, a standard atmosphere) constant. Then we know that if we allow the water content of the air to vary it can range between 0 and some ...
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637 views

How to calculate the amount of gas in a compressed cylinder

I am trying to calculate a cost per hour use of a gas we buy in a cylinder. The details I have been working with are: Gas used CP-grade N2 material number: 110628-L can Gas: ...
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1answer
127 views

Gas Stoichiometry - where is my mistake in dealing with this problem?

A $20.0$-L nickel container was charged with $0.500$ atm of xenon gas and $1.50$ atm of fluorine gas at $400$ $^{\circ}$C. The xenon and fluorine react to form xenon tetrafluoride. What mass of xenon ...
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101 views

What causes spray cans to get cooler when shaken?

I've been searching the web for this phenomenon and surprisingly I found only one post about it. And the reply to this question about canned air begins with words: I don't know about the shaking ...
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Can covalently bonded hydrocarbons be influenced by a magnetic field?

I am doing a University project on Magnetically Assisted Combustion and am curious to know more about how magnetic fields may or may not affect gases such as butane and propane. I think I am right ...
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242 views

Hydrogen and Helium ideal gas behavior in room temperature

Which one of hydrogen and helium behaves more like ideal gas in room temperature... I thought hydrogen gas would show more ideal behavior in room temperature because it has lighter mass (less no of ...
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59 views

How quickly does sulfur hexafluoride mix with the atmosphere?

A common science demonstration is to float a "boat" on sulfur hexafluoride. How long would the sulfur hexafluoride stay in the container (in the experiment linked above) if the container were to be ...
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66 views

Raoult's Law explained with thermodynamics/ free energy

I got some confusion going on with this explanation of Raoult's Law. This is what my book say: Because the ideal solution has a higher entropy than the pure solvent, the energy of a vapor ...
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1answer
141 views

What is the reason for this azeotrope formation?

What is the reason for the formation of an azeotrope? I mean why with certain compositions, one component alone cannot go to vapour phase. Is there any extra force holding the two components together? ...
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457 views

Why does small value of van der Waals gas constant “b” ensure easier liquefication?

Larger value of b signifies that the size of the molecules is larger and hence the forces acting should become larger due to increased surface area.This should ensure easier liquefication. But my book ...
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61 views

How can you achieve negative pressure?

Pressure is the magnitude (absolute value) of the force over the area, so how can that result in a negative value for pressure as would happen in certain circumstances?
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66 views

Why does the graph of compressibility factor(z) vs pressure increase after reaching the minimum?

I understand why it decreases for most of the gases but i cannot understand why it increases after reaching a certain minimum.
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80 views

How to calculate to number of moles using the ideal gas law [closed]

Which quantity of N2 gas has a volume of 11.2 liters at STP? Select one: 1.00 moles 2.00 moles 14.0 grams 28.0 grams
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158 views

how to calculate the gas volume per purge when I change the cylinder?

I have some gas cylinders in a gas cabinet. Every time I change the cylinder, I use N2(100%v/v, 60L/min) to purge the residue gas in the pipe to a local scrubber. I want to know how many gases I ...
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Determining [CO2] of a sample in ppm

I have 20mL gas samples and I need to determine the [CO2] in ppm. I have a Li-Cor 6200 with a closed loop, so essentially I will inject a volume of gas into the loop and the change in the output is ...
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1answer
2k views

What happens if you make a gas of magnetic particles [closed]

I was reading todays SMBC which asked what happens if you make a gas of magnetic particles So what does happen if you make a gas of magnetic particles?
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683 views

How much gas is inside a pressurised gas cylinder?

Given a 19kg Liquid Petroleum Gas (LPG) cylinder, with this specification: LPG inside the cylinder weighs 19kg. The internal volume of the cylinder is ...
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Applying Avagadro's law: the relationship between moles and volume of a gas

If 2.4 moles of gas fill a volume of 175 mL, what volume, in mL, will 5.4 additional moles of gas fill? This was a quiz question which I got wrong the first attempt, and I think I got it right this ...