Does this estimate agree with the prediction

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NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions.

(a) The lattice energies of NaCl and KF are given in Table. Based on the lattice energies, would you expect the Na-Cl or the K-F distance to be longer?

(b) Use the ionic radii given in Figure to estimate the Na-Cl and K-F distances. Does this estimate agree with the prediction you made based on the lattice energies?

TABLE 8.2

- Lattice Energies

Lattice Energy fld/rnol)

for Some Ionic Compound

Compounds

Lattice Energy (10/mol)

Compound

LiF

1030

MgCJ2

2326

LiCI

834

Sick

2127

Lil

730

 

 

VF

910

MgO

3795

Na(]

788

CaO

3114

NaBr

732

Sr0

3217

Nal

682

 

 

ICE

808

ScN

7547

KCI

701

 

 

KBr

671

 

 

CACI

657

 

 

Cs1

600

 

 

 

 

 

 

1459_Br.png

Reference no: EM131025451

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