## example 9.2

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Liam Maxwell 2E
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

### example 9.2

The example asks you to find the change in entropy when a gas is heated at a constant volume. You have to use the equation deltaS=C ln(T2/T1), but I was wondering why you don't have to account for a change in pressure... or is there no change in pressure?

Ashin_Jose_1H
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

### Re: example 9.2

For that example, you would use pressure to calculate moles of the substance. Also, I don't think there was any change in pressure.

Gurshaan Nagra 2F
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

### Re: example 9.2

Can someone elaborate on whether or not there is a pressure change, and if so how can you tell?