Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed in
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(a) C2H4(g) + 3O2(g) -→ 2CO2(g) 1 2H2O(l)
(b) 2H2S(g) + 3O2(g) -→ 2H2O(l) + 2SO2(g)?
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