PP Presentation

H—H = 436 kJ/mol

Cl—Cl = 243 kJ/mol

H—Cl = 431 kJ/mol

• Sum of H-H + Cl-Cl bond energies = 436 kJ + 243 kJ = +679 kJ
• 2 mol H-Cl bond energies = 862 kJ
• Net = DH = +679 kJ - 862 kJ = -183 kJ

Estimating DHrxn for H—H + Cl—Cl ® 2 H—Cl

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