A piston-cylinder assembly is initially 0.1 m3 of ethylene gas at 393K and 35 bar pressure.

contains. The pressure of the gas in the piston-cylinder assembly is reversible and isothermally to 205 bar.

(In all the options below, the conditions for this compression process will be used).

a) Assuming that ethylene obeys the ideal gas equation, the heat transferred between the system and its surroundings

Calculate (J/mol) and work done (J/mol).

b) Assuming that ethylene obeys the Peng-Robinson equation of state, the internal energy during the process

Calculate the change (J/mol).