All Questions
17 questions
2
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Validity of ideal gas law for pure species or mixture
I'm currently dealing with an application involving gases. I have pure nitrogen as a pressurizer and eventually water vapour (only if condition for evaporation or boiling are met).
I wanted to ask to ...
- 33
1
vote
1
answer
135
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How do I go about calculating final temperature of tank draining at saturation?
I am working on calculating pressure in a tank where the fluid is sitting at its vapor pressure. For example, imagine a 12 in diameter 100 L tank of nitrous oxide at room temperature (745 psi vapor ...
-1
votes
1
answer
70
views
Calculating percentage of Zn in a coin
Question:
An old coin found in an ancient temple is composed of zinc coated with copper. In an experiment to find the percent zinc in the coin, a student determined the weight of the coin to be 3.0 g. ...
- 127
1
vote
1
answer
150
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Use the first law of thermodynamics to derive the pressure as a function of T, U, V and N
I am struggling with a thermodynamics question given
$$S(U,V,N)=C_VNK_\mathrm b\ln U/U_0+NK_\mathrm b\ln V/V_0$$ (where $U_0$ and $V_0$ are the reference energies and volumes) and the first law of ...
- 17
9
votes
1
answer
804
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Confusion in Van der Waals Equation
I understand that the behavior of ideal gases deviates largely from that of real gases in terms of pressure exerted by the gas molecules on the container in which it is present, space available for ...
- 121
-1
votes
1
answer
81
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Ideal Gas Equation Extreme Case [closed]
I have recently learned about the Ideal Gas Equation and I have this doubt.....suppose I am in a closed container filled with a gas of fixed volume and definite amount of moles. I am assuming myself ...
- 29
1
vote
2
answers
206
views
Why does CO2 diffuse out of a cylinder in the absence of a pressure difference?
Suppose I have a thermally insulated cylinder containing carbon dioxide (assuming it is ideal) at 1 atm pressure(atmospheric pressure is 1 atm). Now let's consider two cases:
CASE-1: I cut open the ...
- 39
0
votes
1
answer
2k
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Dissolution of CO2 in water
The following question has troubled me for a while.
For gases that are slightly soluble in water, there is a proportional relationship between the partial
pressure, $P$, and the mole fraction, $x$, ...
- 605
2
votes
1
answer
189
views
Find gas pressures of injection knowing mixture pressure without knowing volume
Let's say we have a gas 1 moving inside a pipe (we don't know the geometry) at mass flow rate $Q_1$ and temperature $T_1.$ We inject a gas 2 at some point inside the pipe with gas 1 at mass flow rate $...
- 65
1
vote
1
answer
242
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Work done by system of ideal gas in isobaric expansion
Consider a system of ideal gas in a container with piston and the isobaric expansion of gas takes place.
As the process is isobaric, so initially the pressure of gas is equal to atmospheric pressure ...
- 444
0
votes
0
answers
114
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Volume of compressed helium gas needed for FE test on ball valves
I'm currently doing a case study to find out the exact volume of helium gas required for FE tests on ball valves regards to the valves' volume and pressure class and the number of helium tanks needed ...
1
vote
1
answer
1k
views
What gas law is involved when your ears "pop" when you are on a plane high in the air? [closed]
When you are up in the air, the air pressure decreases and the altitude increases. What gas law is involved in the situation wherein your ears "pop" because of the difference in pressure.
- 19
1
vote
2
answers
137
views
Relationship between the partial pressure $p_J = x_J p$ and the perfect gas law $pV = nRT$
I am currently studying Atkins' Physical Chemistry, 11th edition, by Peter Atkins, Julio de Paula, and James Keeler. Chapter 1A.2 Equations of state says the following:
When dealing with gaseous ...
- 1,103
5
votes
2
answers
902
views
Pressure exerted by a particle of ideal gas
There is a step I fail to grasp in the proof that for a monatomic ideal gas, $U=\frac{3}{2}PV$, where $U$ denotes the internal energy of the gas.
The proof involves considering a particle with mass $m$...
- 169
2
votes
2
answers
551
views
Can Gay-Lussac's law be observed in the reverse direction?
Gay-Lussac's law states that if you decrease the temperature of a gas at constant volume, the pressure decreases by a corresponding amount. This is easy to carry out experimentally. But in practice is ...
1
vote
1
answer
1k
views
Does lowering temperature of a gas make it easier to compress?
My teacher said that for ideal gases,
the lower the temperature, the lower the kinetic energy of a gas will be, and it will be easier to compress the gas.
Using the ideal gas equation $PV=nRT$, if ...
- 1,889
2
votes
1
answer
4k
views
Unknown Mass in Dalton's Law of Partial Pressures
An air with mass of $0.454\ \mathrm{kg}$ and an unknown mass of $\ce{CO2}$ occupy an 85 liters tank at $2068.44\ \mathrm{kPa}$. If the partial pressure of the $\ce{CO2}$ is $344.74\ \mathrm{kPa}$, ...
- 161