3. The heat effects of reactions at 0 C and a constant pressure of 1013 GPa are:
C O2=CO2 ΔH=-405.8 kJ
CO 1|2O2=CO2 ΔH=-284.5 kJ
H2 1/2=H2O(g) ΔH=-246.8 kJ
Calculate the heat effects of the following reactions under the same conditions:
C(graphite) 1/2O2=CO ΔH1
C 2H2O(g)=CO2 2H2 ΔH1

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