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8. Calculate the enthalpy of decomposition of aluminum chloride in the following reaction: 2AlCl3 (s) → 2Al (s) + 3Cl2 (g) Use the following four equations: a) 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) ΔH°f = −1049 kJ/mol b) HCl(aq) → HCl(g) = ΔH°f = 74.8 kJ/mol c) H2(g) + Cl2(g) → 2HCl ΔH°f = -1845 kJ/mol d) AlCl3(s) → AlCl3(aq) ΔH°f = -323 kJ/mol