Which of the following law explains that net heat change in a reaction is same whether it takes place through two or more different ways?
Correct answer: C. Hess's law
- A. Born Haber cycle
- B. Joule's principle
- C. Hess's law
- D. Law of conservation of energy
Explanation
Hess's Law states that the overall enthalpy change of a reaction is independent of the pathway followed as long as the initial and final conditions remain the same.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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