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Grade: 11
        
Calculate the wavelength of the radiation that would cause photo dissociation of chlorine molecule if the
Cl- Cl bond energy is 243 KJ/mol.
9 months ago

Answers : (1)

Arun
13867 Points
							
Cl-Cl bond energy is 243 KJ/mol = 243000 J/mol

​Hence, the energy required to dissociate a Cl-Cl bond in a chlorine (Cl2) molecule = 243000 J mol-1​ / 6.022 x 1023 mol-1 = 4.0 x 10-19 J

Since, E = hc/λ ; λ = hc/E

Hence, 
 6.626 * 10^-34 * 3 * 10^8/4 * 10^-19
 = 4.97 * 10^-7 m
 
= 497 nm
 
Regards
Arun (askIITians forum expert)
9 months ago
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