In thermochemical calculations, why might the enthalpy change calculated using Hess's Law differ from the experimentally observed value?
A.
Hess's Law is only applicable to reactions at room temperature.
B.
The calculated value does not account for the physical states of the substances involved.
C.
The calculated value is based on standard enthalpies of formation, which may not match experimental conditions.
D.
Hess's Law is not valid for reactions involving solutions.
Exam No：AP Chemistry Problem Set 3 Year：2024 Question No：APChemistry2024AP0507
Answer:
C
Knowledge points:
6.9 Hess’s Law
Solution:
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