Question

Lattice energy is _______. a.) the energy given off when gaseous ions combine to form one...

Lattice energy is _______.

a.) the energy given off when gaseous ions combine to form one mole of an ionic solid

b.) the energy required to convert a mole of ionic solid into its constituent ions in the gas phase

c.) the sum of ionization energies of the components in an ionic solid

d.) the sum of electron affinities of the components in an ionic solid

e.) the energy required to produce one mole of an ionic compound from its constituent elements in their standard states.

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Answer #1

Lattice energy is energy required when the compound is formed from its ions in gaseous state. It is defined for 1 mol of compound formed. This process is exothermic that is there is release of energy.

For example for NaCl, the enthalpy for below reaction is lattice energy.

Na+(g) + Cl-(g) -> NaCl(s)

Answer: a

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