Calculate the maximum work done when 64 g of oxygen gas occupying volume of 7 lit  is expanded isothermally and reversibly to 14 lit at 27∘C⋅(R=1.987cal deg −1mol-1)

Wt. of oxygen =64g; mol. wt of O2                             =32gmol-1.So,                      ′′O2=64g32gmol−1=2                            R=1.987caldeg−1mol−1T=27+273=300K;V1=7LV2=14L.We know that :              W=−2.303nRTlog⁡V2V1                            (for isothermal and reversible process)                                 = - 2.303×2mol×1.987×300×log147=-0.693×600×1.987=826.1946≅826