## 8.27

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

JennyCKim1J
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

### 8.27

For 8.27, I thought the equation for an reversible isothermal expansion is: w = -nRT*ln(V2/V1). However, on the answer sheet, "ln" is not part of the equation. Which then is the correct equation? Also, is V2 = final volume and V1 = initial volume?

Justin Lau 1D
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am

### Re: 8.27

Yeah you need the ln to get the correct answer. It's a typo in the answer key cuz the later part with real numbers has ln in it. Also yeah V2 is final answer V1 is initial.