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Bond Enthalpies

AP Chemistry· difficulty 4/5

reactants products TS (Ea) reaction coordinate E

Estimate ΔH\Delta H for H2+Cl2→2HClH_2 + Cl_2 \rightarrow 2HCl using bond energies: H–H = 436, Cl–Cl = 243, H–Cl = 432 kJ/mol.

  • A

    −247-247 kJ

  • B

    −185-185 kJ

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  • C

    −432-432 kJ

  • D

    +185+185 kJ

Explanation

Bonds broken: 436 + 243 = 679. Bonds formed: 2(432) = 864. ΔH\Delta H = 679 - 864 = −185-185 kJ.

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