chemistry

Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed in Appendix 2. (ΔH°f (HgO(s)) = -90.7 kJ/mol and ΔH°f (FeO(s)) = -272 kJ/mol.)
(a) 2 Fe(s) + O2(g) 2 FeO(s)
kJ
(b) 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(l)

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