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Reactivity 1.2.4—An application of Hess’s law uses enthalpy of formation data or enthalpy of combustion data to calculate the enthalpy change of a reaction.

Experiments

Here are experiments our science specialists have selected to support this IB* topic.

Additivity of Heats of Reaction: Hess's Law

Experiment #18 from Chemistry with Vernier

In this experiment, you will

  • Combine equations for two reactions to obtain the equation for a third reaction.
  • Use a calorimeter to measure the temperature change in each of three reactions.
  • Calculate the heat of reaction, ΔH, for the three reactions.
  • Use the results to confirm Hess’s law.

Educational Standard
International Baccalaureate (IB) 2025
Subject
Chemistry
Organizing concepts
Reactivity 1. What drives chemical reactions?
Subtopics
Reactivity 1.2—Energy cycles in reactions
Level
Additional higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.

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