Calculate the heats of combustion for the following
reactions from the standard enthalpies of formation
listed in Appendix 3:
(a) 2H₂(g) + O₂(g) →
(b) 2C₂H₂(g) +50₂(8)
2H₂O(1)
4CO₂(g) + 2H₂O(1)



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