Category Archives: Enthalpy change

Enthalpy change (∆H)

Reactions can be endothermic or exothermic. Definition Enthalpy change (∆H) is the heat energy change measured under conditions of constant pressure. Standard enthalpy changes refer to standard conditions, ie 100 kPa and a stated temperature (eg ∆H298). Students should be able to: • define standard enthalpy of combustion (∆Hc) • define standard enthalpy of formation (∆Hf).

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