申論題

1. (20 points) (a) Consider I mole of ideal gas undergoes a reversible isothermal expansion from V = 1 liter to 2 liters. The temperature is kept at 300 K. Please calculate the change of ertropy of the gas system. (10 points] (b) Now consider the same I mole of ideal gas undergoes an irreversible free expansion process such that the volume is changed from V= 1 liters to 2 liters. What is the change of entropy of the gas? [10 points]