Agas in its ideal-gas state undergoes the following sequence of mechanically reversible processes in a closed system:
a) from an initial state of 70c and 1 bar, it is compressed adiabatically to 150c
b) it is then cooled from 150 to 70c at constant pressure
c) finally, it expands isothermally to its original state
calculate w, q, deltau, deltah, for each process and for the entire cycle. take cv = 12.471 and cp= 20.785 j/mol*k