For the reaction at

CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

For the reaction

2\,\text{NO}_{2}(g) \rightarrow \text{N}_{2}\text{O}_{4}(g)

298\,\text{K}

, the enthalpy change is

\Delta H = 45.0\,\text{kJ}\,\text{mol}^{-1}

and the entropy change is

\Delta S = 125\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

. What is

\Delta G

for the reaction at

298\,\text{K}

? (a)

-7.75\,\text{kJ}\,\text{mol}^{-1}

(b)

+15.5\,\text{kJ}\,\text{mol}^{-1}

(c)

+7.75\,\text{kJ}\,\text{mol}^{-1}

(d)

+41.3\,\text{kJ}\,\text{mol}^{-1}