Calculate the delta heat of reaction given the following data: SiO2(s) + 4HF(g) --> SiF4(g) + 2H2O(l) delta H [SiO2(s)] = -910.9 kJ/mol delta H [HF(g)] = -273 kJ/mol delta H [SiF4(g)] = -1614.9 kJ/mol delta H [H2O(l)] = -285.840 kJ/mol