Compute the heat of formation of liquid methanol in kilojoules per mole, using the given data: $\Delta H_{vap}$ of liquid methanol $= -38\: kJ/mol, \Delta H_f^{\circ}\: of\: H(g), C(g), O(g)$ respectively are $218, 715\: and\: 247\: kJ/mol$. Also, $\Delta H_{C-H}, \Delta H_{C-O}, \Delta H_{O-H}$ being $415, 356, 463 \: kJ/mol$ respectively.

Question

$\begin {array} {1 1} (A)\;228\: kJ/mol & \quad (B)\;-228\: kJ/mol \\ (C)\;266 \: kJ/mol & \quad (D)\;-266 \: kJ/mol \end {array}$