Question

Calculate the reaction enthalpy for the synthesis of aluminum chloride,

2 Al (s) + 3 Cl₂ (g) → 2 AlCl₃ (s) from the following data:

2 Al(s) + 6 HCl(aq) → 2 AlCl₃(aq) + 3 H₂ (g) ΔH∞ = -1049 kJ.

HCl (g) → HCl (aq) ΔH∞ = -74.8 kJ.

H₂(g) + Cl₂(g) → 2 HCl (g) ΔH∞ = -185 kJ.

AlCl₃(s) → AlCl₃ (aq) ΔH∞ = -323kJ.