Question

At the standard temperature and pressure (STP) of $0$ ${}^{o}C$ and $1$ atmosphere, the Gibbs free energy change is ______.

• A. $-247kJ/mol.$
• B. $-257kJ/mol.$
• C. $-237kJ/mol.$
• D. $-227kJ/mol.$

Answer 1

The correct option is C $-237kJ/mol.$

At the standard temperature and pressure (STP) of $0$ ${}^{o}C$ and $1$ atmosphere, the Gibbs free energy change is $-237kJ/mol$. The negative value means that the reaction should be spontaneous in the forward direction.

$H_2\left(g\right)$ + $\frac{1}{2}$ $O_2\left(g\right)\rightleftharpoons H_{2}O\left(l\right)$ $G^0=$ $-237kJ/mol$

Hence, the correct option is $\text{C}$