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Classification of Elements and Periodicity in Properties
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25/08/2021 2:19 pm
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The electron affinity of chlorine is 3.7 eV. 1 g of chlorine is completely converted to Cl- ion in a gaseous state. (1 eV = 23.06 kcal mol-1). Energy released in the process is
(a) 4.8 kcal
(b) 7.2 kcal
(c) 8.2 kcal
(d) 2.4 kcal
1 Answer
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25/08/2021 2:27 pm
Correct answer: (d) 2.4 kcal
Explanation:
Number of moles = \(\frac{1}{35.5}\)
Given, 1 eV = 23.06 kcal mol-1
3.7 eV = 3.7 × 23.06 kcal mol-1
i.e. 1 mole released energy = 3.7 × 23.06 kcal
∴ Energy released = \(\frac{1}{35.5}\) x 3.7 x 23.06 kcal
= 2.4 kcal