12. Calculate the heat of formation for the following reactions from the standard enthalpies of formation listed in Appendix 2: (a) 2H2(g) + O2 (g) 2H20(1) (b) 2C2H2 (g) + 502(g) 4CO2(g) + 2H2O(1) (c) 2C2H4(g) +3 02 (g). 2002(g) acet + 2H2O(1)

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