Question

For the process $A(l,\,0.05\,\text{atm},\,32^\circ C) \rightarrow A(g,\,0.05\,\text{atm},\,32^\circ C)$, the correct set of thermodynamic parameters is

• A. $\Delta G = 0$ and $\Delta S = -ve$
• B. $\Delta G = 0$ and $\Delta S = +ve$
• C. $\Delta G = +ve$ and $\Delta S = 0$
• D. $\Delta G = -ve$ and $\Delta S = 0$
• E. $\Delta G = 0$ and $\Delta S = 0$

Hint:

Phase change to gas always increases entropy.

Answer 1

The Correct Option is B

Concept:
At phase equilibrium: \[ \Delta G = 0 \] Entropy increases when liquid converts to gas.

Step 1: Phase change.
Liquid $\rightarrow$ gas increases randomness.

Step 2: Entropy change.
\[ \Delta S > 0 \]