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Question

The quantum yield for decomposition of HI is 0.2. In an experiment 0.01 moles of HI are decomposed. Find the numbers of photons absorbed. (NA=6×1023).

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Solution

As we know that, in 1 mole of HI we have 6.022×1023 number of HI molecules, then in 0.01 mole of HI we will have =6.022×1023×0.01=6.022×1021 numbers of HI molecules.
As quantum yield = Molecules decomposed / photon absorbed
photon absorbed = Molecules decomposed /quantum yield =6.022×1021/0.2=3.011×1022

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