If heat of formation of C + O₂ → 2CO is ΔH = -110.5 kcal,then heat of combustion

If heat of formation of C + O₂ → 2CO is ΔH = -110.5 kcal,then heat of combustion of carbon is

(a) -94 kcal/mol
(b) 110.5 kcal/mol
(c) 16.5 kcal/mol
(d) 15 kcal/mol

-94 kcal/mol

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