Q.

The electron affinity of Fluroine is 3.45 eV. How much amount of energy in cal is released when 2 g of atomic Fluroine is completely converted to Fllouride ion in a gaseous state?

(1 ev = 23.06 cal/mol)

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a

12.8 kcal

b

2.8 kcal

c

4.8 kcal

d

8.84 kcal

answer is B.

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Detailed Solution

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Cl35.5+eCl+3.8K3.8×23.06Kcal.

Energy released when 2gram Cl is converted into Cl ions =3.8×23.0635.5×25kcal

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