value of R?


and

Moderators: Chem_Mod, Chem_Admin

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

value of R?

Postby Saachi_Kotia_4E » Mon Jan 28, 2019 9:17 pm

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?

Postby 405161024 » Mon Jan 28, 2019 9:19 pm

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?

Postby Jessica Chen 1F » Mon Jan 28, 2019 9:20 pm

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?

Postby Amy Dinh 1A » Tue Jan 29, 2019 4:05 pm

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

Vanadium Wang 4H
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Re: value of R?

Postby Vanadium Wang 4H » Sun Feb 03, 2019 8:47 pm

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


Return to “Calculating Work of Expansion”

Who is online

Users browsing this forum: No registered users and 3 guests