\( =77.2 \times 10^3-400 \times 122=28400 \mathrm{~J} \)
\( \Delta \mathrm{G}^{\circ}=-2.303 \mathrm{RT} \log \mathrm{K} \)
\( \Rightarrow 28400=-2.303 \times 8.314 \times 400 \log \mathrm{K} \)
\( \Rightarrow \log \mathrm{K}=-3.708=-37.08 \times 10^{-1}\)
( $373\, K$ તાપમાને પાણી નું $\Delta H _{\text {vap }}$ $K =41$ કિલોજૂલ/મોલ $\left. R =8.314\, JK ^{-1} mol ^{-1}\right)$)