1.

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

Answer»

to separate one mole of SOLID NaCl into one mole of `Na_((g))` and one mole of `Cl_((g))` to infinite distance
to separate one mole of solid NaCl into one mole of `Na_((g))^(+)` and one mole of `Cl_((g))^(-)` to infinite distance
to CONVERT one mole of solid NaCl into one mole of GASEOUS NaCl
to convert one mole of gaseous NaCl into one mole of solid NaCl.

Solution :Lattice energy is the energy REQUIRED to separate 1 mole of an ionic compound into its ions in gaseous state.
`NaCl_((s)) to Na_((g))^(+) + Cl_((g))^(-) , Delta_("lattice")H^(@) = 788" kJ " mol^(-1)`


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