Tests on an adiabatic gas compressor yield values for inlet conditions $(T_1,P_1)$ and outlet conditions $(T_2,P_2).$ Assuming the gas to be

ideal with constant heat capacities, determine the compressor efficiency for the following:

$T_1=295K,P_1=1\mathrm{.}2$ bar, $T_2=455K,P_2=6$ bar, and $\frac{C_P}{R}=\frac{9}{2}$

The compressor efficiency is