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Define the "standard enthalpy change of atomisation".

This is a standard definition question that is relatively common in A level papers.

 

The standar molar enthalpy change of atomisation is defined as the enthalpy change when 1 mol of an element in its standard state is atomised to produce 1 mol of gaseous atoms.

 

By "standard state" we mean the state the element is naturally found, for example for Chlorine it is Cl2(g) and for Sodium it is Na(s). 

Daniel G. A Level Chemistry tutor, GCSE Chemistry tutor, GCSE Physics...

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