## Gas Constant

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

Hailey Boehm 2H
Posts: 71
Joined: Fri Sep 28, 2018 12:24 am

### Gas Constant

Is there an easy way to figure out what gas constant I should use? Which one is used the most often in the reversible expansion work equation, w= -nRTln(v2/v1)?

Tuong Nguyen 2I
Posts: 71
Joined: Fri Sep 28, 2018 12:26 am
Been upvoted: 1 time

### Re: Gas Constant

I believe the one that is most often used is the 8.314 J.K^-1.mol^-1 one. However, each constant will be on the constants and equations sheet for the midterms/tests, so just pay attention to your units and which ones you need to cancel out, and you'll know which gas constant to use.

Brian Chhoy 4I
Posts: 66
Joined: Fri Sep 28, 2018 12:16 am

### Re: Gas Constant

The 8.314 J*mol^-1 *K^-1 would be the R value that you need to calculate the w in that equation. If you need to convert units, 101.325 J= 1L*atm. Thus R also equals 0.082057 L*atm* mol^-1 *K^-1, which is the R value used In the ideal gas law.

Hilda Sauceda 3C
Posts: 76
Joined: Fri Sep 28, 2018 12:24 am

### Re: Gas Constant

from the examples i have seen done they usually use that one so i dont think they will switch it up on us.