4.7 Exercise 40

A diatomic ideal gas is brought from an initial equilibrium state at $p_{1} = 0.50 \text{atm}$ and $T_{1} = 300 \text{K}$ to a final stage with $p_{2} = 0.20 \text{atm}$ and $T_{1} = 500 \text{K} .$ Use the results of the previous problem to determine the entropy change per mole of the gas.