A mole gas goes from an initial state of 278 K and 20 bar where it's molar volume is 1.15610^-3 m^3 mol^-1 to a final state of 333 K and 1 bar. What is Delta H and Delta U for this process?

Assume that for gas PV/T is constant and that Cv=20.785 J/mol K and Cp=29.100 J/mol K

Create a path at least contains isothermal or Adiabatic pathway. Justified assumption can be made.

What if process are 60% efficient?