Question

For a phase change, $H_{2}O\left(\ell \right)\underset{0^{o}C,1bar}{\rightleftharpoons }{H}_{2}O\left(s\right)$

• A. $△G=0$
• B. $△S=0$
• C. $△H=0$
• D. $△U=0$

Answer 1

The correct option is A $△G=0$

A system or process at equilibrium has $\Delta G$ equal to zero, $\Delta G=0$. The free energy change, $\Delta G$ is neither positive nor negative because process (system) at equilibrium has a zero free energy change.