Question

whar is enthalpy Change
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Answer 1

Answer:

It is the heat content of a system. The heat that passes into or out of the system during a reaction is the enthalpy change. ... Enthalpy is the heat content of a system. The enthalpy change of a reaction is roughly equivalent to the amount of energy lost or gained during the reaction.

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Answer 2

Answer:

The standard enthalpy of reaction for a chemical reaction is the difference between total reactant and total product molar enthalpies, calculated for substances in their standard states. This can in turn be used to predict the chemical bond energy liberated or bound during reaction

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