CaC2.  Given the thermochemical equations below, calculate the ΔHfo for acetylene in kJ/rxn.   CaO(s) + H2O(l) --->  Ca(OH)2(s)                                 ΔH = - 65.3 kJ/rxn CaO(s) + 3C(s, graphite)  ---> CO(g)+ CaC2(s)              ΔH = + 462.3 kJ/rxn CaC2(s) + 2 H2O(l) ---> Ca(OH)2(s) +  C2H2(g)              ΔH = - 126.0 kJ/rxn 2C(s, graphite) + O2(g)  ---> 2CO(g)                            ΔH = - 221.0 kJ/rxn 2 H2O(l) ---> 2H2(g) + O2(g)                                          ΔH = + 572.0 kJ/rxn

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