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Bond Enthalpies

AP Chemistry· difficulty 4/5

For 2 H₂(g) + O₂(g) → 2 H₂O(g) (each H₂O has 2 O-H bonds)

H-H 436 O=O 498 O-H 463

Estimate ΔH using bond energies (kJ/mol).

  • A

    +482 kJ

  • B

    -1852 kJ

  • C

    -482 kJ

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  • D

    -241 kJ

Explanation

Bonds broken: 2(436) + 498 = 1370. Bonds formed: 4(463) = 1852. ΔH = 1370 - 1852 = -482 kJ.

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