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Question

The amount of energy released when 1012 atoms of Cl (vapour) are converted to Cl ions, according to the equation:
Cl(g)+eCl(g) is 58×1010 J
Calculate the ΔegH of Cl atom in eV atom1.

A
0.036 eV atom1
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B
3.480 eV atom1
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C
+0.038 eV atom1
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D
0.361 eV atom1
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Solution

The correct option is A 0.036 eV atom1
The amount of energy released when 1 mole of Cl is converted to Cl ions,
=58×1010 J×6×10231012
= 3.48 kJ mol1
We know that,
1 eV atom1=96.49 kJ mol13.4896.49=0.036 eV atom1

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