what is enthalpy and change in enthalpy
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Enthalpy is a central factor in thermodynamics. 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. ... The enthalpy change of a reaction is roughly equivalent to the amount of energy lost or gained during the reaction.
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Enthalpy is an energy-like property or state function—it has the dimensions of energy (and is thus measured in units of joules or ergs ), and its value is determined entirely by the temperature, pressure, and composition of the system and not by its history. In symbols, the enthalpy, H, equals the sum of the internal energy,
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