10. Use the values of ΔHf° in Appendix 4 to calculate ΔH° for the following reactions. a. C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(g). b. SiCl4(l) + 2 H2O(l) → SiO2(s) + 4 HCl(aq) c. MgO(s) + H2O(l) → Mg(OH)2(s)