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The enthalpy is the heat content of a chemical system. Therefore
the enthalpy change is the amount of heat released or absorbed when a chemical reaction occurs at constant pressure. The ΔH (enthalpy change) = H(products)(the enthalpy of the products) – H(reactants)(the enthalpy of the reactants). The enthalpy change is usually defined per mole in the unit, kJmol-1. Energy changes are measured under standard laboratory conditions (25oC – 298K & 101.3kPa – 1 atmosphere). Enthalpy changes must also always be measured where the reactants and products are in


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