alleryStart learning →Dissociating one mole of solid sodium chloride into separate gaseous ions requires:
A7690 kJ
B769 kJ
C76.9 kJ
D7.69 kJ
Answer & Solution
Correct answer: B. 769 kJ
1. Pulling every ion out of a lattice against all its neighbours costs a great deal of energy.
2. It requires 769 kilojoules of energy to dissociate one mole of solid sodium chloride.
3. The products are separate gaseous sodium and chloride ions.
4. That large figure is why ionic solids have high melting points.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 7 'Chemical Bonding and Molecular Geometry', sections 7.1-7.6_
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