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

In this worksheet, we will practice calculating reaction enthalpies by applying Hess’s law to reaction cycles based on standard enthalpy changes.

Q1:

Using the data below, calculate, to 4 significant figures, the standard molar enthalpy of combustion of ethanol.

SubstanceHO()2gCHOH()25lCO()2g
Δ𝐻f(kJ/mol)241.82277.6393.51

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