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Enthalpy of Formation

AP Chemistry· difficulty 3/5

CH₄ + 2 O₂ → CO₂ + 2 H₂O ΔHf° (kJ/mol): CH₄ -75 O₂ 0 CO₂ -393 H₂O(l) -286

What is ΔH°rxn for the combustion of methane (using values shown)?

  • A

    -604 kJ

  • B

    -186 kJ

  • C

    +890 kJ

  • D

    -890 kJ

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Explanation

ΔH°rxn = [(-393) + 2(-286)] - [(-75) + 2(0)] = (-965) - (-75) = -890 kJ.

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