Hess's law is known as:
Correct answer: A. Law of heat summation
- A. Law of heat summation
- B. Law of constant heat capacity
- C. Law of mass action
- D. Law of conservation of mass
Explanation
Hess's law of heat summation, also known as Hess's law, states that the enthalpy change for a chemical reaction is the same whether the reaction takes place in one step or in a series of steps. This means that the enthalpy change for a reaction is independent of the pathway taken.The law of heat summation is based on the fact that enthalpy is a state function. This means that the enthalpy of a system depends only on its state, and not on the pathway taken to reach that state.
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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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