### Formula for reversible expansion

Posted:

**Sat Jan 20, 2018 2:53 pm**What does the R represent in the formula for reversible expansion?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=129&t=25900

Page **1** of **1**

Posted: **Sat Jan 20, 2018 2:53 pm**

What does the R represent in the formula for reversible expansion?

Posted: **Sat Jan 20, 2018 3:01 pm**

R is just the gas constant from the ideal gas law (PV=nRT), so it would be 8.314 J K^-1 mol^-1)

Posted: **Sat Jan 20, 2018 4:55 pm**

The ideal gas constant from PV = nRT is given as 0.08206 (L*atm)/(mol*K). For R to be more applicable to w = -nRT*ln(V_{final}/V_{initial}), they rewrote it with the conversion 101.325 J = 1 L*atm to get 8.3145 J/(K*mol).