Finding the Heat of Reaction (Enthalpy) from Heats of Formation

Calculate the heat of reaction at the standard reference state for the following reactions:

2CaO(s) + 2MgO(s) + 4H2O(l) ----> 2Ca(OH)2(s) + 2Mg(OH)2(s)

NaCl(s) + 2SO2(g) + 2H2O(l) + O2(g) ----> 2Na2SO4(s) + 4HCl(g)

n-C4H10(g) ----> C2H4(g) + C2H6(g)

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...c and heat of reaction is a negative number. If heat is absorbed, the process is endothermic and heat of reaction is a positive number. Thus,
Heat of Reaction = Sum of products-Sum of reactants
assume H is heat of reaction for each species

Heat of ...