Problem 2.61

What amount of heat has to be transferred to $v=3.0$ moles of carbon dioxide to keep its temperature constant while it expands into vacuum from the volume $V_{1}=5.0$ $\mathrm{l}$ to $V_{2}=10$ $\mathrm{l}$ ? The gas is assumed to be a Van der Waals gas.

Q=v^{2} a\left(V_{2}-V_{1}\right) / V_{1} V_{2}=0.33 \mathrm{~kJ}

First law of thermodynamics, heat capacity