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What is enthalpy and change in enthalpy (ΔH)?

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Enthalpy - Itis a measurement of energy in a thermodynamic system. It is equal to the internal energy of the system plus the product of pressure and volume. Enthalpy changeis the name given to the amount of heat evolved or absorbed in a reaction carried out at constant pressure. It is given the symbolΔH, read as "delta H". Note:The term "enthalpy change" only applies to reactions done at constant pressure.

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