Question

A gas cylinder contains N2 at 200 kPa and 80°C. As a result of cooling at night the pressure in the cylinder drops to 190 kPa and the temperature to 30°C. How much work was done on the gas?

Answer 1

Work done on the gas = $P(V_2-V_1)$

Volume is constant , $V_1=V_2$

So,$W=0$