### Midterm Question 6B

Posted: **Tue Mar 13, 2018 11:47 pm**

by **Katelyn 2E**

Can anyone explain/provide their work for this question? For further reference, it is the one where 2/3 of the question was taken out and the one that remained was "under constant volume." How would you figure out moles for this question, too?

### Re: Midterm Question 6B

Posted: **Wed Mar 14, 2018 12:15 am**

by **Kelly Kiremidjian 1C**

For this question I used the equation deltaS=nCvln(T2/T1)

You need to find the moles first, however using PV=nRT. Everything is given besides moles, so you can solve for n:

n=(1.00 atm)(53.48L)/(.08206)(303K) to get n=2.15 moles.

You can then use n to solve for change in entropy, using Cv as 3/2R because its constant volune:

deltaS=(2.15)(3/2)(8.314)ln (333K/303K)

and you should get deltaS=2.53 J x K-1

Hope this helps!