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Hess's Law of Heat Summation
Chemistry · 5th Year · Fuels and Heats of Reaction · 3o Periodo

Hess's Law of Heat Summation

Students learn to apply Hess's Law to calculate the enthalpy changes of reactions that cannot be measured directly.

NCCA Curriculum SpecificationsNCCA Leaving Certificate Chemistry: Section 5 - Fuels and Heats of Reaction;State Hess's Law and apply it to calculate heats of reaction from standard heats of formation and combustion.

About This Topic

Students learn to apply Hess's Law to calculate the enthalpy changes of reactions that cannot be measured directly.

Key Questions

  1. How can we determine the heat of a reaction that cannot be measured directly?
  2. Why is Hess's Law considered an application of the Law of Conservation of Energy?
  3. How do we use standard heats of formation to calculate overall enthalpy changes?

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