## value of R?

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

Saachi_Kotia_4E
Posts: 68
Joined: Fri Sep 28, 2018 12:23 am

### value of R?

what is the value of the constant R? in one of the homework problems, we used R=0.08206 in the n=PV/RT formula, but then we used R=8.314 in the w=-nRTlnV1/V2 formula. why is the value of R different?

405161024
Posts: 36
Joined: Fri Sep 28, 2018 12:25 am

### Re: value of R?

R is specific to each gas, it is a constant that is given

Jessica Chen 1F
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

### Re: value of R?

R is 0.08206 in the PV=nRT formula because its units are L atm K-1 mol-1 in that case.
R is 8.314 in the w=-nRTlnV1/V2 formula because its units are J K-1 mol-1 in that case.

Amy Dinh 1A
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

### Re: value of R?

The values of constant R are different due to the different units shown in each equation.

Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

### Re: value of R?

Depending on the question, the gas constant, R = 8.314 J*K-1*mol-1 = 8.206*10-2 L*atm*K-1*mol-1 = 8.314*10-2 L*bar*K-1*mol-1 = 62.364 L*Torr*K-1*mol-1

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