. A reversible cycle executed by 1 mol of an ideal gas for which cp=5/2 R and cv=3/2R consists of the following:

i. Starting at T1=700K and P1=1.5 bar, the gas is cooled at constant pressure to T2=350K.

ii. From 350K and 1.5 bar the gas is compressed isothermally to pressure P2.

iii. The gas return to its initial state along a path for which PT=constant.

What is the thermal efficiency of the cycle?