Calculate $\Delta$ G_r ^$\circ$ for the Decomposition of Mercury(II)oxide at 298 K

Multiple Choice

Calculate $\Delta$ G_r ^$\circ$ for the decomposition of mercury(II) oxide at 298 K.

A) -117.1 kJ.mol^-1
B) +246.2 kJ.mol^-1
C) -64.5 kJ.mol^-1
D) +117.1 kJ.mol^-1
E) -246.2 kJ.mol^-1