Question

How to solve thermodynamics's sum in physics?

Answer 1

by the help of formulas

Answer 2

FIRST KEEP IN MIND TO USE THE PHYSICAL SIGN convention carefully unlike as we do in chemical convebtion cuz, both have sign alteration
Secondly use Molar heat capacity formula carefully as we don't take ∆Cvm to the reference of gas taken.....

HOPE IT HELPS