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

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Percent composition, maybe?

I've attempted to solve this problem with percent composition, but it says the answer is wrong. Is it a PV=nRT problem, and if so, can I use the units as they are given? A 0.02867 g sample of gas ...
0
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1answer
13 views

A 4.00 L sample of gas is cooled from 67 °C to a temperature at which its volume is 2.60 L [closed]

A $4~\mathrm{L}$ sample of gas is cooled from $67~\mathrm{°C}$ to a temperature at which its volume is $2.6~\mathrm{L}$. What is this new temperature? Assume no change in pressure of the gas.
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1answer
9 views

Quick Stoich & Gasses

I have a quick question in Stoich and Gasses, I however could not get any far, any answer will be appreciated. Thank You. A sample of $\ce{Pb(NO3)2}$ is heated, yielding $\ce{O2, NO2\ gas,\ and\ ...
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1answer
34 views

Gas Stoichiometry & Ideal Gas Law

I need a little help with one of the problems below. Any help on the problem below will be appreciated. I don't want to sound like an idiot, I will also provide my work. Solid $\ce{NaHCO3}$ ...
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1answer
21 views

What will happen to the entropy and free energy of the gasses when the partition is removed?

Consider a container of volume $ 5.0$ L that is divided into two compartments of equal size. In the left compartment there is nitrogen at $1.0$ $atm$ and $25 °C$; in the right ...
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1answer
40 views

What conditions can cause a material to exist as a gas?

So my question is, how can something exist a gas. Is it when the pressure exerted by the gas is greater than the atmospheric pressure, then it is a gas? And also how do manometers work, how can you ...
2
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1answer
51 views

Where does this equation for the activity in the gas phase equilibrium between N2, H2 and NH3 come from?

I have a question with Equilibrium Constant. I understand that for a reaction in equilibrium $aA +bB \rightleftharpoons cC +dD$ $$K_c= \frac{[C]^c[D]^d}{[A]^a[B]^b}$$ and $K_p$ is just using the ...
2
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1answer
59 views

Ideal gas law derivation from kinetic theory

Consider the derivation of the ideal gas law from kinetic theory presented here: http://en.wikipedia.org/wiki/Kinetic_theory I have some questions This derivation assumes the container is a cube, ...
3
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1answer
30 views

Proportion of gases in Ideal Gas Mixture?

Suppose methane ($CH_4$) and ethane ($C_2H_6$) in a container. The specific gravity is $r_g=0.6$. I think this means $0.6=\frac{\rho_{CH_4}}{\rho_{C_2H_6}}$. Now I am trying to understand the ...
3
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2answers
34 views

Compressible Factor

I 've a soft question on the terminology of compressibility factor. It is termed compressible factor because, its value determines how any reals gas is compressible with respect to an ideal gas ...
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3answers
43 views

Plotting p/T against T

This is about the ideal gas equation $$pV=nRT$$ to plot ${p}\over{T}$ against $T$, where ${nR}\over{V}$ is constant. How would this graph look like?
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35 views

How to determine an unknown gas in a tube with a massless piston at equilibrium conditions?

There is a massless piston that can move freely in a horizontal tube that is closed at both ends. To the left, there is a sample of helium gas at $300~\mathrm{K}$ and $4~\mathrm{atm}$. To the ...
2
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0answers
48 views

How to find Gibbs energy for a real gas

I'm asked to find $\Delta G$ for the isothermal compression of $N_{2(g)}$ (real gas) at $0°C$ if the gas expands from $P=1\space atm$ to $P=1000 \space atm$. The fugacity coefficients are ...
0
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4answers
84 views

How to find the empirical formula for an nitrogen oxygen compound from the given mass of nitrogen and the product?

$5.00~\mathrm{g}$ of nitrogen is completely converted into an oxide of nitrogen. The mass of the oxide formed is $19.3~\mathrm{g}$. The empirical formula of the oxide would be? My working: ...
2
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1answer
47 views

Gas laws question, condensed partial pressure?

So I'm relatively new to gas laws as I just started learning it at school. I've been doing fine so far until I got stuck on this question, any ideas? A mixture of three gases N2, CO2 and O2 has a ...
4
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1answer
57 views

Volume of different gas in a container

I know that technically two or more gases in one container should have different volumes. But when you imagine the gas molecules being mixed together, it look sorta like the two gases have the exact ...
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1answer
431 views

Using combined gas law to calculate the volume of dry hydrogen gas

Pv/t = pv/t is the equation of combined gas law. Say if the volume of wet hydrogen gas is 40.48ml does this equation still work if part of that volume is water vapor. Or in another word, does the ...
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0answers
17 views

How to calculate the volume of dry hydrogen in magnesium/ HCl reaction [duplicate]

Sorry if this will sound trivial, I am not too sure if the moles of $H_2$ in the equation $Mg(s) + 2HCl(aq)\rightarrow MgCl_2(aq) + H_2$ is that of dry or wet hydrogen. If the $H_2$ refers to wet ...
0
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1answer
28 views

Stoichiometry of Gaseous Reactions

The Question: How many liters of $H_2S$ would be required to react with excess oxygen to produce $12.0$ $L$ of $SO_2$? The reaction yield is $88.5$%. Assume constant temperature and pressure ...
0
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1answer
67 views

How does pressure change reflects in this formula? [closed]

The pressure is missing or I guess is integrated in the adiabatic constant. But I don't know how to even derive the adiabatic constant for a certain gas.
0
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0answers
71 views

Finding Root-Mean-Square of Ne using kinetic energy?

I am not being able to solve the following question: -Find the root-mean-square speed of $\ce{Ne}$ atoms at the temperature at which their kinetic energy is $\mathrm{6.24\ kJ/mol}$. I tried ...
0
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1answer
59 views

Proof of kinetic energy equation

Is there a way to prove that $\frac{1}{2} mv^2 $$= \frac{3}{2}RT$ The first one is kinetic energy and the second is the average kinetic energy. Can this be proved by component of velocity.
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0answers
34 views

A way to rationalize avogadro's hypothesis

How can one rationalize avogadro's hypothesis using the equation of kinetic molecular theory. Did you see anything? I can't
-1
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1answer
75 views

Will the propane liquefy?

Consider a 1:1 mix of propane and nitrogen at 60 °F and 75 psi. Will the propane liquefy if pressure is increased to 200 psi? This is a real world question. I am experimenting in the oilfield with a ...
0
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1answer
65 views

Undergrad Kinetic Molecular Theory

Gas A and B are placed together in a sealed container at room temperature and are pressurized to 2.5atm. After a period of time, there is a border between the two gases. Given A has a density ...
3
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1answer
52 views

Significance of Kinetic Velocities?

In the concept of Kinetic Molecular Theory we have rms(root mean square), avg(average) and mp(most probable) velocities. I understand the concept well. But my question is why do we have three ...
3
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1answer
54 views

Which gas is easier to compress, the ideal gas or a real gas?

Since the pressure of a real gas is less than that of the ideal gas and its volume is more than that of ideal gas, I am assuming that the real gas is difficult to compress in comparison to an ideal ...
0
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1answer
78 views

Calculating collision diameter with viscosity, but not having the mass given

I've got a homework question i'm stumped on. The viscosity of the ethylene gas was measured at $99.8*10^{-7} \textrm{ N s m}^{-2}$ at $288 \textrm {K}$. Calculate the collision diameter in ...
2
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1answer
39 views

The Van Der Waals Equation - High T and High $V_m$

This one is for my physical chemistry homework and I'm having trouble finding the answer. At high temperatures the Van Der Waals equation has the form $$P\approx\frac{RT}{V_M-b}$$ What would ...
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1answer
29 views

Addition of combined gas law constant

There are two containers connected to each other but separated by a cork. If container(1) has a gas $G_1$ at a volume $V_1$, pressure $P_1$ and temperature $T_1$ and similarly in container(2) there ...
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1answer
17 views

How to determine the pressure to output a gas to achieve a particular gas flow rate?

I have a 420-liter (14.9 cubic ft) helium cylinder and a pressure regulator with a gauge supporting up to 160 psi. My requirement is to ensure a flow of 10 to 15 liters / min. How do I determine the ...
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2answers
60 views

The relationships between n , T , P , V for a gas?

The symbols : T : temperature // V : volume // P : pressure // n : number of mole what it is clearly known about the relationship between one another is : P is inversely proportional to V ( from ...
2
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3answers
117 views

What is the partial pressure of oxygen in this mixture of oxygen and argon?

A $19.3\:\mathrm{g}$ mixture of oxygen and argon is found to occupy a volume of $16.2\:\mathrm{L}$ when measured at $675.9\:\mathrm{mmHg}$ and $43.4\:\mathrm{^\circ{}C}$. What is the partial ...
2
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1answer
16 views

A 1.00 L gas at 100. °C and 500. torr contains 70.0 % He and 30.0 % Ne by mass. What is the partial pressure of He?

A $1.00~\mathrm{L}$ gas at $100~^\circ\mathrm{C}$ and $500~\mathrm{torr}$ contains $70.0\%~\ce{He}$ and $30.0\%~\ce{Ne}$ by mass. What is the partial pressure of $\ce{He}$? My answer is ...
0
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1answer
42 views

What is the relationship between pressure and stoichiometry ratios

This is the question from the textbook. Ozone O3 can be prepared in the laboratory by passing an electrical discharge through oxygen gas. Assume that an evacuated steel vessel with a volume of 10L ...
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3answers
44 views

What are the units for m in the average kinetic energy formula?

For the equation $E_k=\frac{1}{2}mu^2$ what does the $m$ variable represent? I would say mass but the textbook does not say explicitly that it is anything.
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2answers
52 views

Henry's Law with varying temperature

I am trying to determine what the derived partial pressure would be for CO2 in the global atmosphere from historical inconstant temperatures and CO2 concentrations of the global atmosphere: Is it ...
4
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1answer
80 views

gas: moles and pressure

For example, lets say we have a question where we have to use the ideal gas law and lets say that moles and temperature are constant. Then the gas law can also be written as $$n\mathcal{R}T=PV.$$ ...
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1answer
58 views

What is the mass of 1 Liter of ethylene at 2000 bar pressure?

I was wondering the weight of 1 liter of ethylene at 2000 bar and 310 Kelvin? I have tried to just multiply the weight at 1 bar with 2000 but I don't think i got the correct answer because the answer ...
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1answer
28 views

Does Le Chatelier's principle apply to the gas inside an air mattress?

While sleeping on an air mattress yesterday a thought occurred to me. I had to re-inflate the air mattress since it was getting rather low and after it had a good stiffness to it, I went to sleep. The ...
1
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1answer
27 views

Why can air accommodate more water when the air has a higher temperature?

The amount of water(g) that air can accommodate depends on temperature. The absolute humidity then is defined as the percentage of water to air and decreases when the temperature decreases. The ...
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1answer
534 views

How much carbonation is in one liter of commercial fountain coke-cola

From what I understand generally coke is carbonated to roughly 6.2g per liter in bottles and cans, or 3.1 volumes of CO2. I was watching this video because I was curious about how fountain soda ...
4
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2answers
52 views

Validity of Henry's Law for an Oxygen/Bitumen System?

Henry's Law is for a gas dissolved in a liquid and states P = kC where P is the partial pressure of the gas above the solution and C is the concentration of the gas dissolved in the liquid. The k is a ...
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2answers
152 views

Can a volume of gas be measured by change in PSI?

I had a visit from an air conditioner repairman who brought with him a tank of refrigerant. He measured the system and determined that the pressure was about 20 psi too low. So he added refrigerant to ...
2
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1answer
73 views

How to calculate the concentration after a certain timespan from the specific reaction constant?

I've been going crazy with this question for the past 4 hours. I can't find much help in google because it's not a traditional "find the velocity of the reaction" question. It's fine if you don't give ...
0
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1answer
273 views

What is Inversion Temperature in terms of Joule Thomson Effect? Does Critical Temperature depend upon Inversion Temperature?

I couldn't find a clear answer in my book and on the internet. Please help! Your quick response will be appreciated.
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1answer
66 views

Internal and external pressure during a gas expansion

There is a solid substance in a rigid cylinder with a piston placed on top such that the distance between the piston and the bottom of the cylinder is essentially zero, and then the substance ...
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1answer
52 views

Ideal gas law? implied volume?

Working on a practice exam. The question is ...
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2answers
200 views

How much Carbon Dioxide would be required to displace enough oxygen to prevent ignition?

In air, how much $\ce{CO2}$ would be required to prevent a match to light or a butane lighter to work? I have a basement office that is unusable because of an apparent lack of Oxygen, currently it ...
2
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2answers
80 views

Plotting a calibration curve for Gas-Liquid Chromatography

Textbook solution: Why aren't the points like this: $(20,5) (40,10) (60,15) (a,7)$ then to plot the curve we use $y=mx+c$ and then find the value of '$a$'