Consider the following data. 2 CaO(s)  2 Ca(s) + O2(g)   H = +1270.2 kJ CO2(g)  C(s) + O2(g)   H = +393.5 kJ CaO(s) + CO2(g)  CaCO3(s)   H = -178.3 kJ Use Hess's law to calculate H for the reaction below. 2 CaCO3(s)  2 C(s) + 2 Ca(s) + 3 O2(g) H =  kJ

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