Calculate standard internal energy change($\Delta E^{\circ}$) for the reaction $OF2(g) + H_2O(g) \rightarrow O_2(g) + 2HF(g)$ Given standard enthalpies of formation $\Delta H_f^{\circ}\: of\: OF_2(g), H_2O(g)\: and\: HF(g)$ are23, -241.8 and -268.6 kJ/mol respectively.

Question

$\begin {array} {1 1} (A)\;320.877\: kJ & \quad (B)\;-318.4 \: kJ \\ (C)\;-320.877 \: kJ & \quad (D)\;318.4\: kJ \end {array}$