Calculate the standard enthalpy change for a reaction: $CO_2\: (g) + H_2\: (g) \rightarrow CO\: (g) + H_2O\: (g)$ given that $\Delta H_f^o\: for\: CO_2\: (g), CO\: (g)\: and \: H_2O\: (g)\: as\: -393.5, -110.5\: and\: -241.8 \: kJ/mol$ respectively.

Question

$\begin {array} {1 1} (a)\; -41.2\: kJ & \quad (b)\;745.8 \: kJ \\ (c)\;41.2 \: kJ & \quad (d)\;-745.8\: kJ \end {array}$