Enthalpy, H, is the heat content stored in a chemical system.
If heat is released, the amount of energy that leaves a chemical system is exactly the same as the amount that goes into the surroundings. This is the law of conservation.
Heat loss in a chemical system = heat gain to the surroundings
Heat gain in a chemical system = heat loss from surroundings
Enthalpy change, ΔH, is;
- the heat exchange with the surroundings during a chemical reaction, at constant pressure
- the difference between the enthalpy of the products and the enthalpy of the reactants
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