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)