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Al + 3/2 Cl₂ ------> AlCl₃
Al diruas kiri :
Al + 3HCl ----> AlCl₃ + 3/2H₂ ΔH = + 119.850 kal
Cl₂ diruas kiri :
3/2 H₂ + 3/2 Cl₂ ----> 3HCl ΔH = + 66.000 kal
AlCl₃ diruas kanan :
Al + 3HCl ----> AlCl₃ + 3/2 H₂ ΔH = + 119.850 kal
Maka :
3/2 H₂ + 3/2 Cl₂ ----> 3HCl ΔH = + 66.000 kal
Al + 3HCl ----> AlCl₃ + 3/2 H₂ ΔH = + 119.850 kal +
Al + 3/2 Cl₂ -----> AlCl₃ ΔH = + 185.850 kal