## 9.13 Entropy Change

$\Delta S = \frac{q_{rev}}{T}$

Vanessa Romero-Campos 2B
Posts: 39
Joined: Fri Sep 25, 2015 3:00 am

### 9.13 Entropy Change

During the test of an internal combustion engine,3.00 L of nitrogen gas at 18.5 degrees Celsius was compressed suddenly and irreversibly to 0.500 L by driving in a piston. in the process, the temperature of the gas increased to 28.1 degrees celsius. Assume ideal behavior. what is the change in entropy of gas?

I know I have to calculate the entropy change relating to the change in volume and then the change relating to temperature and add them together. What i do not understand is how to find the value of n in delta S= n*R*ln T2/T1 and delta S=n*R*ln v2/v1

Lena Nguyen 2H
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am
Been upvoted: 1 time

### Re: 9.13 Entropy Change

The problem doesn't give us the number of moles, but the solutions manual says to assume n = 1 mol.

sahiltelang-Discussion 1J
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

### Re: 9.13 Entropy Change

Since it states ideal behavior, we can assume that it is 1 mole of substance.