1 kg of gaseous CO2 contained in a closed system undergoes a reversible process at constant pressure. During this process 45 kJ of internal energy is decreased. Determine the work done during the...

1 kg of gaseous CO2 contained in a closed system undergoes a reversible process at constant pressure. During this process 45 kJ of internal energy is decreased. Determine the work done during the process. Take: Cp = 840 J / kg ° C and Cv = 600 J / kg ° C.