Lesson Worksheet: Hess Cycles Using Bond Energies Chemistry • 10th Grade

In this worksheet, we will practice calculating reaction enthalpies by comparing the standard bond enthalpies of the reactants and the products.


Gaseous sulfuric acid decomposes at high temperature to form sulfur dioxide, oxygen, and steam. The bonds in these molecules have different energies, as indicated in the diagram. All labeled bond energies are in units of kilojoules per mole.

Calculate the enthalpy change for this reaction per mole of oxygen gas produced.

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