Identify the exothermic reaction(s).

a) AgCl (s) → Ag⁺ (aq) + Cl^– (aq); ΔH = 127 kJ/mol

b) 2 Mg (s) + O₂ (g) → 2 MgO (s); ΔH = –1203 kJ/mol

c) Na₂SO₄ • 10 H₂O (s) → Na₂SO₄ (aq) + 10 H₂O (l); ΔH = 74 kJ/mol

d) 2 Al (s)+ Fe₂O₃(s) ⟶ 2 Fe (s) + Al₂O₃ (s); ΔH = −852 kJ/mol

e) 2 Fe₂O₃ (s) + 3 C (s) → 4 Fe (s) + 3 CO₂ (g); ΔH = 468 kJ/mol

f) CaO (s) + H₂O (l) → Ca(OH)₂ (s); ΔH = −65.2 kJ/mol