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Hess's Law

AP Chemistry· difficulty 4/5

C(s) + O₂(g) → CO₂(g) ΔH = -393.5 kJ C(s) + ½O₂(g) → CO(g) ΔH = -110.5 kJ

C(s) + O₂(g) CO₂(g) CO(g) + ½O₂ ΔH = -393.5 ΔH = -110.5 ΔH = ?

What is ΔH for CO(g) + ½O₂(g) → CO₂(g)?

  • A

    -504.0 kJ

  • B

    -283.0 kJ

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  • C

    -393.5 kJ

  • D

    +283.0 kJ

Explanation

Reverse step 2 (+110.5) and add step 1 (-393.5): ΔH = -393.5 + 110.5 = -283.0 kJ.

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