## 9.13

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

Ammarah 2H
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

### 9.13

For #13 on the homework, why isn't the C value used instead of R in the calculation for the temperature? (I was looking at the example and they used C, not R).

Cassidy 1G
Posts: 54
Joined: Fri Sep 29, 2017 7:07 am

### Re: 9.13

There was a correction made to the solution manual for this problem on the class website. In the correct solution Cv=5/2 R is used.

Swetha Sundaram 1E
Posts: 59
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

### Re: 9.13

Correct me if I'm wrong, but 3/2R represents a monatomic gas, 5/2R represents a diatomic gas, and 7/2R represents a polyatomic gas?

ConnorThomas2E
Posts: 57
Joined: Fri Sep 29, 2017 7:04 am

### Re: 9.13

For ideal gases, it is 5/2R at constant volume and 3/2R at constant pressure

Ammarah 2H
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

### Re: 9.13

I believe that the values of C are based off whether the atom is at constant pressure or volume. I think the 7/2 R is for a linear molecule at constant pressure, 3/2 R is for an atom at constant volume, and 5/2 R is for an atom at constant pressure.

Jana Sun 1I
Posts: 52
Joined: Sat Jul 22, 2017 3:00 am

### Re: 9.13

Is there a specific homework problem that uses 7/2R? I'm just a little surprised because I haven't seen it before and I'm not sure when I would know to use it.

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