Δ_f G^° at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcal mol^-1 and +103 kcal mol^-1, respectively. Vapour pressure of…

$\displaystyle \Delta_{\mathrm{f}} \mathrm{G}^{\circ}$ at $\displaystyle 500$ K for substance 'S' in liquid state and gaseous state are $\displaystyle +100.7 \mathrm{kcal} \mathrm{mol}^{-1}$ and $\displaystyle +103 \mathrm{kcal} \mathrm{mol}^{-1}$, respectively. Vapour pressure of liquid 'S' at $\displaystyle 500$ K is approximately equal to : $\displaystyle \left(\mathrm{R}=2 \mathrm{cal} \mathrm{K}^{-1} \mathrm{~mol}^{-1}\right)$