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Hess's Law

AP Chemistry· difficulty 4/5

Given ΔH1=−394\Delta H_1 = -394 kJ for C(s)+O2(g)→CO2(g)C(s) + O_2(g) \to CO_2(g) and ΔH2=−283\Delta H_2 = -283 kJ for CO(g)+12O2(g)→CO2(g)CO(g) + \tfrac{1}{2}O_2(g) \to CO_2(g), what is ΔH\Delta H for C(s)+12O2(g)→CO(g)C(s) + \tfrac{1}{2}O_2(g) \to CO(g)?

  • A

    −111-111 kJ

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  • B

    +111+111 kJ

  • C

    −677-677 kJ

  • D

    −394-394 kJ

Explanation

Reaction 1 - Reaction 2: target = ΔH₁ - ΔH₂ = -394 - (-283) = -111 kJ.

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