## Textbook question clarification

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

Hee Sang Kim 3L
Posts: 33
Joined: Fri Sep 25, 2015 3:00 am

### Textbook question clarification

There was a textbook question asking "Calculate the change in molar entropy of an ideal gas when it is compressed isothermally to one-third its initial volume. " Is ideal gas implaying that is 1 mol of gas? How do we know the mole of gas

Ronald Yang 2F
Posts: 86
Joined: Fri Sep 25, 2015 3:00 am

### Re: Textbook question clarification

Well, it's asking for the molar entropy, so number of moles does not need to be specified.

Alisha Clark
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

### Re: Textbook question clarification

When it does not specify and the gas is ideal you assume that it is 1.00 mole of gas available.