10.)A gas obeys the Berthelot equation of state given below. One mole of this gas is expanded isothermally from 20 L to 50 L at 300 K. RT a P= V-nb TV² For this gas, let a = 1.639 L-atm-K/mol, and b = 0.06049 L/mol a.) Compute AU and AS for the process. b.) Derive expressions for the internal energy, enthalpy and entropy imperfections for this gas. c.) Use your derived values to compute AU, AH and AS for the process.