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What is ‘enthalpy change’?
the heat energy transferred at constant pressure.
Why is enthalpy change written as
\Delta H\degree ?
To show reactants and products must be in their standard states and measurements were made in standard conditions.
What are the standard conditions for enthalpy change?
100kPa (1 atm)
Stated temperature - normally 298K (25°C)
What energy change is breaking bonds associated with?
Energy is taken in to break bonds → endothermic reaction