An Endothermic Reaction Has $\mathrm{D}_{\mathrm{r}} \mathrm{H}_{298}^{\circ}=+389.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$ $D_{1} S_{298}^{\circ}=+497.2 \mathrm{JK}^{-1} \mathrm{mol}^{-1}$

Multiple Choice

An endothermic reaction has $\mathrm{D}_{\mathrm{r}} \mathrm{H}_{298}^{\circ}=+389.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$ , $D_{1} S_{298}^{\circ}=+497.2 \mathrm{JK}^{-1} \mathrm{mol}^{-1}$ and $D_{1} G_{298}^{\circ}=+241.3 \mathrm{~kJ} m ol^{-1}$ . Find the temperature, T(K) , at which the reaction becomes spontaneous.

A) 298.
B) 783.
C) 0.78.
D) 1.28.