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Standard XII

Chemistry

Addition Reaction

photochemical...

Question

photochemical dissociation produces a normal oxygen atom and an oxygen atom 2.5ev more energetic than normal one. also the average bond energy of oygen itno noraml oxygen is 498kj/mol. determine the longest wavelength required for photochemical dissociation of oxygen.

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Solution

$B o n d e n e r g y o f o x y g e n p e r m o l e c u l e = \frac{498 \times 10^{3}}{6.022 \times 10^{23}} = 8.26 \times 10^{- 19} J E n e r g y r e q u i r e d f o r p h o t o c h e m i c a l d e c o m p o s i t i o n o f o n e m o l e c u l e o f O_{2} = 8.26 \times 10^{- 19} J + 2.5 \times 1.6 \times 10^{- 19} J (1 e v = 1.6 \times 10^{- 19} J) = 1.226 \times 10^{- 18} J λ = \frac{h c}{E} = \frac{6.626 \times 10^{- 34} \times 3 \times 10^{8}}{1.226 \times 10^{- 18}} = 16.214 \times 10^{- 8} = 162 n m$

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