Achieve Homework Question 6 Week 5 and 6

[105561735]

Hope this finds you all well. The main issue I am having with this problem is that I calculated the change in entropy of the volume and found the value to be 28.134 and the entropy of the temperature change to be 19.175. However, adding both of them seems not to lead to the correct answer.

Formula I used for both was:
Temp: N* Cv* Ln( T2/T1)
Volume: N* Cv* Ln( V2/V1)

Let me know if I am doing anything wrong. Thank you!

[HaleyWong1A]

Hi! I believe you are using the wrong formula for the change in volume. Because there is a change in volume you can't use the specific heat capacity at constant volume (Cv). So the formula should be deltaS = nRlnV2/V1 (n = moles, R = 8.314). From there you can add the changes in entropies as you were doing before.