Question

it has been found that gaseous molecul just dissociat into iodine atom after absorption of light at wavelength4995 angestrom the required to dissociate one mole of iodine molecule is

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Answer 1

Answer:57.3 Kcal/mol

Explanation:

Formula used : E = h*e

E = energy = ?

h = Planck's constant = 6.63 x 10^-34 Js

c = speed of light = 3 x 10^8 m/s

Lambda = wavelength = 4995 A° = 4995 x 10^-10 m

Now put all the given values in the above formula,

Energy = (6.63 x 10^-34 Js)*(3 x 10^8m/s) = 2995 x 10^-10m

E = 3.979 x 10^-19 J = 9.51 x 10^-23 Kcal

The energy required for 1 mole of Iodine molecule will be,

E = 9.51 x 10^-23 Kcal x 6.022 x 10^23 mole^-1 = 57.3 Kcal/mol

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