Problem 2.135

Vessels 1 and 2 contain $v=1.2$ moles of gaseous helium. The ratio of the vessels' volumes $V_{2} / V_{1}=\alpha=2.0,$ and the ratio of the absolute temperatures of helium in them $T_{1} / T_{2}=\beta=1.5$. Assuming the gas to be ideal, find the difference of gas entropies in these vessels, $S_{2}-S_{1}$