Question

Calculate the wavelength of light that would, upon absorption, provide

sufficient energy to a molecule to break

(i) a 412 kJ mol-1 C-H bond,

(ii) a 463 kJ mol-1 O-H

bond,

(iii) a 276 kJ mol-1 C-Br bond, and

(iv) a 238 kJ mol-1 C-I bond.

Answer 1

Bond energy is calculated for one mole.

when we calculate wavelength we have to consider one molecule.

so we have to divide bond energy by Avogardo number.