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Question

From the following sequence calculate the lattice energy of AB(s):
A(s)A(g)+e; 610kJmol1
B(g)+eB(g); 260kJmol1
A(s)+B(g)AB(s); 569kJmol1

A
219
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B
919
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C
+1539
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D
+301
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Solution

The correct option is B 919
The lattice energy of a crystalline solid is usually defined as the energy of formation of the crystal from infinitely-separated ions, molecules, or atoms.
let the equations be 1, 2 and 3.
We will get the lattice energy by 321= 569+260610 =919

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