10. Work done by a system under isothermal change from a

volume V1 to V2  for a gas which obeys Vander Waal’s equation (V – βn)[ P + (αn2/v)= nRT (a)   nRT loge( V2 – nβ/V1–  nβ) + α n2(V1 -V2)/V1V2 (b)  nRT log10 ( V2 – αβ/V1–  αβ) + α n2(V1 -V2)/V1V2 …