Enthalpy and internal energy

2012 AIPMT-PRE 1 question

1. 1 Thermodynamics
   Standard enthalpy of vapourisation $\Delta_{vap}H^\ominus$ for water at $100^\circ C$ is 40.66 kJ $mol^{-1}$. The internal energy of vapourisation of water at $100^\circ C$ (in kJ $mol^{-1}$) is
   A +40.66 B +37.56 C −43.76 D +43.76
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