Thermochemistry #2: What is enthalpy and enthalpy change?

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Professor Thiago

Published on Jul 10, 2019
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Do you know what enthalpy is and what the enthalpy variation of a reaction is? Defining these concepts is central to thermochemistry. This video presents the concept of enthalpy, focusing on its mathematical definition, the relationship between enthalpy variation and heat exchanged between the system and its surroundings at constant pressure, and the fact that enthalpy is a state function. Enthalpy is one of the main state functions studied in thermodynamics and, in particular, in thermochemistry. This is related to the fact that the enthalpy variation of processes that occur at constant pressure is equal to the heat involved in the process. Therefore, when we talk about enthalpy of combustion, enthalpy of neutralization, enthalpy of reaction, enthalpy of fusion, etc., we are referring to the heat involved in these processes (at constant pressure).

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