Chemistry - Thermochemistry Question with Solution | TestHub

Boiling Point ($T$): The vaporization phase transition occurs at the higher temperature jump, where $T=100K$.

Entropy Change ($\Delta S_{vap}$): At $100K$, the entropy jumps vertically from $400J/K$ to $600J/K$.

Calculation of $\Delta S_{vap}$: $\Delta S_{vap}=600-400=200J/K$.

Molar Enthalpy ($\Delta H_{vap}$): Using $\Delta H_{vap}=T\times \Delta S_{vap}=100K\times 200J/K=20,000J=20kJ$.

Correct Option: (C) 20 kJ