Calculate the work of an isothermal (at temperature T), reversible expansion from V1to V2 of n moles of a van der Waal gas. -n R T \ln \left(\frac{V_{2}-n b}{V_{1}-n b}\right)-a n^{2}\left(\frac{1}{V_{1}}-\frac{1}{V_{2}}\right) \bigcirc_{-n R T} \ln \left(\underline{V_{1}-n b}\right) -n R T \ln \left(\frac{V_{2}-n b}{V_{1}-n b}\right)-a n^{2}\left(\frac{1}{V_{2}}-\frac{1}{V_{1}}\right) -a n^{2}\left(\frac{1}{V_{2}}-\frac{1}{V_{1}}\right)

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