Rank the following salts by largest to smallest lattice energy:CsCl, MgBr2, LiCl

Question

Rank the following salts by largest to smallest lattice energy:CsCl, MgBr2, LiCl, CaO, NaCl.
(Note: the 2 in MgBr2 should be a subscript, referring to the solidmagnesium bromide).

a. CaO >CsCl > MgBr2 > LiCl > NaCl
b. CaO > MgBr2> LiCl > NaCl > CsCl
c. CsCl > MgBr2> NaCl > LiCl > CaO
d. CsCl > NaCl> LiCl > MgBr2 > CaO
e. CaO > MgBr2> CsCl > LiCl > NaCl

Please would you explain this problem to me. If given asimilar problem on an exam, how would I determine the correctanswer. I.e. please give me some tools with which to answerthis question. I do not know where to begin.

Explanation / Answer

Increase in charges increase the lattice energy Smaller radius increases the lattice energy CsCl: +1, -1 MgBr2: +2, -1 (smaller than CaO) LiCl: +1, -1 CaO: +2, -2 (largest) NaCl: +1, -1 Between CsCl, LiCl, and NaCl; LiCl has a smaller radius than NaCl,which is smaller than CsCl. Overall: CaO > MgBr2 > LiCl > NaCl > CsCl Choice B

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