Calculate the heats of combustion for the following
Calculate the heats of combustion for the following reactions from the standard enthalpies of formations listed in appendix 3
(a) 2H2(g) + O2(g) = 2H2O(l)
(b) 2C2H2(g) + 5O2(g) = 4CO2(g) + 2H2O(l)
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