(Solved): 28) Calculate the heats of combustion for the following reactions from the st ...

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28) Calculate the heats of combustion for the following reactions from the standard enthalpies of formation. (a) \( \mathrm{C}_{2} \mathrm{H}_{4}(g)+3 \mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{CO}_{2}(g)+2 \mathrm{H}_{2} \mathrm{O}(l) \) (b) \( 2 \mathrm{H}_{2} \mathrm{~S}(\mathrm{~g})+3 \mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+2 \mathrm{SO}_{2}(g) \) Material standard enthalpies of formation