Problem: Which pair of compounds is listed in order of increasing (more exothermic) lattice energy?a) LiF < LiIb) NaCl < KCl c) MgO < CsCld) CaO < BaCl2e) LiF < MgO

FREE Expert Solution

The lattice energy can be estimated using:


lattice energy=cation charge×anion chargecation period # + anion period #


a. LiF vs LiI

LE LiF = |(1)(1)|(2)(2)=14=0.25


LE LiI= (1)(1)(2)(5)=110=0.10

LiF < LiI → incorrect


b. NaCl < KCl 

LE NaCl = (1)(1)(3)(3)=19=0.11


LE KCl= (1)(1)(4)(3)=112=0.083

NaCl < KCl → incorrect


c. MgO < CsCl

LE MgO = |(2)(-1)|(3)(2)=26=0.33


LE CsCl= |(1)(-1)|(6)(3)=118=0.056

MgO < CsCl→ incorrect

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Problem Details

Which pair of compounds is listed in order of increasing (more exothermic) lattice energy?

a) LiF < LiI

b) NaCl < KCl 

c) MgO < CsCl

d) CaO < BaCl2

e) LiF < MgO


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