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Questions tagged [ideal-gas]

For questions about the ideal gas law or gases which can be well approximated as an ideal gas.

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5 votes
2 answers
872 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 $m$...
James Well's user avatar
14 votes
4 answers
7k views

What is the physical significance of the universal gas constant R?

While studying work done in isothermal processes I was told that the universal gas constant $R$ is the work done by the gas per mole per kelvin. I am sure I am missing something basic but I didn't ...
Sparks's user avatar
  • 169
8 votes
1 answer
731 views

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 ...
anotherhyooman's user avatar
5 votes
2 answers
229 views

Dalton's law clarification

I'm looking at Elements of Physical Chemistry by Atkins and de Paula. In section 1A.3, they state Dalton's law as The pressure exerted by a mixture of perfect gases is the sum of the pressures that ...
scmartin's user avatar
4 votes
1 answer
1k views

Will entropy increase in adiabatic expansion? [closed]

The formula for entropy change states that change in entropy is not possible if heat change is nil. ∆S=∆Q/T But what if we adiabatically expand a gas? Won't the molecules get more space to vibrate in, ...
Krish vasa's user avatar
4 votes
0 answers
203 views

How much energy is required to operate a Sabatier reactor?

I am trying to model some industrial processes and having a hard time finding information about the Sabatier reaction. The Sabatier reaction combines $\ce{CO2}$ (and possibly $\ce{CO}$) with $\ce{H2}$ ...
dlight's user avatar
  • 337
1 vote
3 answers
2k views

Specific Heats for Non-Constant Processes

Why can the specific heat at constant Pressure ($C_p$) be used to calculate the change in enthalpy as $\text{d}H = C_p\text{d}T\newcommand{\d}{\text{d}}$ for processes that are not even at constant ...
Alfred's user avatar
  • 11
0 votes
1 answer
176 views

How can enthalpy of an ideal gas be independent of pressure?

I know that when one applies a manipulation of the Ideal Gas Law to the Maxwell Relations the result that enthalpy is independent of pressure tumbles out of it, i.e., $(\mathrm dH/\mathrm dp)=0$. I ...
MattGeo's user avatar
  • 153