Compute each part of given problem:
Problem: Suppose 2.50 mol of an ideal gas undergoes a reversible isothermal expansion from volume V1 to volume V2 = 2.00V1 at temperature T = 110 K.
Part A: Find the work done by the gas.
Part B: Find the entropy change of the gas.
Part C: If the expansion is reversible and adiabatic instead of isothermal, what is the entropy change of the gas?
Please, try to give explanation. Thanks.