Question

The standard Gibbs free energy change for the reaction $H_{2}O{H}^{+}+O{H}^{-}at{25}^{\circ }C$ is

• A. 100 KJ
• B. –90 KJ
• C. 90 KJ
• D. –100 KJ

Answer 1

The correct option is B –90 KJ

$\Delta G^{\circ }=-2.303$ RT log K
$(kfor{H}_{2}O=\frac{{10}^{-14}}{55.6})\therefore \Delta G^{\circ }=-2.303\times 8.314\times 298\times log\frac{{10}^{-14}}{55.6}=-89.84KJ$