1. Heat of Displacement
• Definition:
– Energy change when one mole of metal is displaced from its salt
solution by a more electropositive metal.
• Example
iron is displaced from its salt iron(II)
sulphate solution by zinc
Zn + FeSO4  ZnSO4 + Fe
∆H = -80.6 kJ
Ionic equation
Zn + Fe2+  Zn2+ + Fe
The heat given off when one mole of
iron is displaced is 80.6 kJ
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2. How to determine heat of
displacement?
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