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Born-Haber Cycle

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Harvey Buckle

on 21 August 2018

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Transcript of Born-Haber Cycle

21st August 2018
To know what is Lattice enthalpy
To know how this links with the Born Haber cycle
To be able to do calculations based on this
How far is it to the moon?
Lattice enthalpy
The lattice dissociation enthalpy is the enthalpy change needed to convert 1 mole of solid crystal into its scattered gaseous ions. Lattice dissociation enthalpies are always positive.
What affects the size of LE?
The charges on the ions

Sodium chloride and magnesium oxide have exactly the same arrangements of ions in the crystal lattice, but the lattice enthalpies are very different.

The lattice formation enthalpy is the enthalpy change when 1 mole of solid crystal is formed from its scattered gaseous ions. Lattice formation enthalpies are always negative.
The radius of the ions

The lattice enthalpy of magnesium oxide is also increased relative to sodium chloride because magnesium ions are smaller than sodium ions, and oxide ions are smaller than chloride ions.

So they are closer

Born Haber cycle
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