The melting points for the compounds Li2S, Rb2S, and K2S are 900, 500, and 840 degrees C, respectively. Give the three compounds in order of increasing lattice energy

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elijah22love elijah22love

22-01-2021
Chemistry

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The melting points for the compounds Li2S, Rb2S, and K2S are 900, 500, and 840 degrees C, respectively. Give the three compounds in order of increasing lattice energy

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kobenhavn kobenhavn · Answer 1 · 2021-01-27T03:47:04+01:00

Answer: [tex]Rb_2S[/tex] < [tex]K_2S[/tex] < [tex]Li_2S[/tex]

Explanation:

Lattice energy is the energy required to dissociate 1 mole of the an ionic compound into its constituent ions.

Thus higher is the lattice energy more energy will be required to melt the compounds.

As [tex]Li_2S[/tex] has highest melting point, it will require most energy to melt an hence it will have highest lattice energy. The order of three compounds in order of increasing lattice energy

[tex]Rb_2S[/tex] < [tex]K_2S[/tex] < [tex]Li_2S[/tex]