APFIVE Standard Versus Experimental Enthalpy
The standard enthalpy change (ΔH°) for a reaction is calculated using standard enthalpies of formation (ΔH°f). An experimental measurement of the reaction’s enthalpy change reveals it is less exothermic than the calculated value. Which of the following provides the best explanation for this discrepancy?
A
Neglected the effect of temperature on the ΔHf° values.
B
No mistake; the calculation and conclusion are correct.
C
Failed to account for the reaction’s stoichiometry.
D
Used incorrect ΔHf° values for the reactants or products.
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