# Question: calculate the entropy change for 1 mol of a diatomic...

###### Question details

Calculate the entropy change for 1 mol of a diatomic gas when it expands from its initial volume of 5 L and 31.5°C to:

(a) a final volume of 25L reversibly and isothermically.

(b) irreversibly and isothermically against an external pressure of
1 atm.

(c) a final volume of 25 L reversibly and adiabatically.

Yes, it is zero, but you have to demonstrate it.

(d) irreversibly and adiabatically against an external pressure of
1 atm.

(e) For all cases above, calculate also the change in entropy for
the surroundings and the

universe.