Heat of combustion $\Delta $Ho for C(s), H2(g) and CH4(g) are $-$ 94, $-$ 68 and $-$213 kcal/mol, then $\Delta $Ho for C(s) + 2H2(g) $ \to $ CH4(g) is

Question

Heat of combustion $\Delta $H^o for C_(s), H_2(g) and CH_4(g) are $-$ 94, $-$ 68 and $-$213 kcal/mol, then $\Delta $H^o for C_(s) + 2H_2(g) $ \to $ CH_4(g) is

$-$17 kcal