An engine using 1 mol of an ideal gas ini- tially at 16.1 L and 325 K performs a cycle consisting of four steps: 1) an isothermal expansion at 325 K from 16.1 L to 31.5 L; 2) cooling at constant volume to 163 K; 3) an isothermal compression to its original volume of 16.1 L; and 4) heating at constant volume to its original temperature of 325 K. Find its efficiency. Assume that the heat capacity is 21 J/K and the univer- sal gas constant is 0.08206 L atm/mol/K 8.314 J/mol/K.

An engine using 1 mol of an ideal gas ini- tially at 16.1 L and 325 K performs a cycle consisting of four steps: 1) an isothermal expansion at 325 K from 16.1 L to 31.5 L; 2) cooling at constant volume to 163 K; 3) an isothermal compression to its original volume of 16.1 L; and 4) heating at constant volume to its original temperature of 325 K. Find its efficiency. Assume that the heat capacity is 21 J/K and the univer- sal gas constant is 0.08206 L atm/mol/K 8.314 J/mol/K.