Entropy and Ideal Gases

Question 1

What equation relates the change in entropy of of an ideal gas undergoing a quasi-static reversible process with its temperature, volume and heat capacity?

Answer 1

∆S = Cv ln(T2/T1) + nR ln(V1/V2)

Question 2

What equation relates the change in entropy of of an ideal gas undergoing a quasi-static reversible process with its volume and heat capacity?

Answer 2

∆S = nR ln(V2/V1)

Question 3

What is the change in entropy of a gas plus its surroundings in an isolated system?

Answer 3

zero