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The lattice energy of NaCl is 788 kJ mol...

The lattice energy of NaCl is `788 kJ mol^(-1)` . This means that 788 kJ of energy is required

A

to separate one mole of solid NaCl into one mole of Na (9) and one mole of CI (g) to infinite distance

B

to separate one mole of solid NaCl into one mole of `Na^(+) (g)` and one mole of` Cl^(-)` (g) to infinite distance

C

to convert one mole of solid NaCl into one mole of gaseous Naci

D

to convert one mole of gaseous NaCl into one mole of solid NaCl

Text Solution

Verified by Experts

The correct Answer is:
B
Lattice energy is that amount of energy which is required to separate one mole of a solid into its constituents gaseous ions at infinite distances.
Since the lattice energy of NaCl is `788 kJ mol^(-1)` it meas that 788 kJ of energy is required to separate one mole of solid NaCl into one mole of `Na^(+)` (g) and one mole of `Cl ^(-)` (g) to infinite distance.
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Knowledge Check

  • The lattice energy of NaCl is +788 kJ mol^(-1). The enthalpies of hydration of Na^(+) (g) and Cl^(-) (g) ions are 406 kJ mol^(-1)and-378 kJ mol^(-1) respectively. The enthalpy of solution of NaCl(s) in water is

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    `4 kJ mol ^(-1)`
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    `- 4 kJ mol ^(-1)`
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    `- 792 kJ mol ^(-1)`

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