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Enthalpy change
The heat energy transferred in a reaction at constant pressure
Symbol: ΔH
Units: kJ mol⁻¹
Standard conditions
Pressure: 100kPa
Temperature: stated in method
What does ΔH⦵ mean?
Substances in standard states and measurement made under standard conditions
Exothermic reaction
Give out energy
Negative ΔH
Temp increases
Endothermic reaction
Absorb energy
Positive ΔH
Temp decreases
Standard enthalpy of combustion
Enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions
Standard enthalpy of formation
Enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions
