Thermodynamics and Thermochemistry - Result Question 27
27. For the process $H _2 O(l)(1$ bar, $373 K) \rightarrow H _2 O(g)$ (1 bar, $373 K$ ), the correct set of thermodynamic parameters is
(2007, 3M)
(a) $\Delta G=0, \Delta S=+$ ve
(b) $\Delta G=0, \Delta S=-$ ve
(c) $\Delta G=+$ ve, $\Delta S=0$
(d) $\Delta G=-$ ve, $\Delta S=+$ ve
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Answer:
Correct Answer: 27. (a)
Solution:
At transition point ( $373$ $ K, 1.0$ bar), liquid remains in equilibrium with vapour phase, therefore $\Delta G=0$. As vaporisation occur, degree of randomness increases, hence $\Delta S > 0$.
BETA
