Which statements are true? Select all that are True. a) For a given equation of state, to develop departure functions for U, G, H, S, you could develop all four departures by evaluating only two integrals and then combining results. b) For a state change from 1 to 2, the ideal gas state change is added to the departure of state1 and the departure of state2 is subtracted. c) When three real roots exist for a pure fluid at a certain T and P, it means that two phases must exist at that state. d) The ideal gas calculation is a fundamental part of a state change calculation using departure functions.

This problem applies the Peng-Robinson equation of state to an adiabatic compressor.

a) Using the Peng-Robinson equation of state, calculate the work needed in (Kj/mol) for a steady-state flow reversible adiabatic compression of gaseous FREON-12, a refrigerant, from a pressure of 0.1 Mpa and temperature of 300K to a pressure of 5 Mpa.

b) What is the work needed (Kj/mol) if the compressor efficiency is 0.88?