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Q.

The electron affinity of oxygen is 12.2 eV. 1gm of oxygen is completely converted to O− Ion in a gaseous state [1 eV=23.06Kcal/mol]  Energy released in the process.

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a

12.672 Kcal 

b

17.583 Kcal

c

26.986 Kcal.      

d

22.354 Kcal

answer is A.

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Detailed Solution

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No of moles of oxygen = 1/16 mol
Given 1eV =23.06Kcal/mol
12.2 eV=12.2 x 23.06 Kcal=17.58 Kcal

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The electron affinity of oxygen is 12.2 eV. 1gm of oxygen is completely converted to O− Ion in a gaseous state [1 eV=23.06Kcal/mol]  Energy released in the process.