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ΔHd = H-Cl - (1/2 H-H + 1/2 Cl-Cl)
= 431 - (218 + 121)
= 431 - 339
= 92 kJ/mol
mol HCl = gr/Mr = 146/36,5 = 4 mol
kalor yang dibutuhkan adalah
4 x 92 = 368 kJ