Chemistry - Thermodynamics - II Question with Solution | TestHub

If heat of vaporisation of water at $100^{\circ }\mathrm{C}$ is $40.6\mathrm{kJ}/\mathrm{mol}$, then when $9{}^{\prime }{\mathrm{g}}^{\prime }$ of water vapours of condensed to liquid at 100 C and 1 atm , then $\Delta {\mathrm{S}}_{\text{sys. }}=54.42\mathrm{J}/\mathrm{K}$.

When ${\left(\Delta {\mathrm{G}}_{\text{system }}\right)}_{\mathrm{P},\mathrm{T}}<0$, the reaction must be exothermic.

$\mathrm{dG}=\mathrm{VdP}-\mathrm{SdT}$ is applicable for closed system in which both PV and non $\mathrm{P}-\mathrm{V}$ work occurs.

If ${\left(\Delta {\mathrm{G}}_{\text{system }}\right)}_{\mathrm{P},\mathrm{T}}<0$, then process can be work producing.