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5 bond enthalpy problems. Given: C-H=413, C-C=347, C=C=614, O=O=498, C=O=804, O-H=464, H-H=436, Cl-Cl=243, H-Cl=432, N-H=391, N≡N=945. Q1: 'H₂ + Cl₂ → 2HCl. Bonds broken = 436 + 243 = ___. Bonds made = 2(432) = ___. ΔH = ___kJ' (679, 864, -185). Q2: 'C₂H₆ → C₂H₄ + H₂. Broken: 1×C-C + 6×C-H = ___. Ma

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