The quantum yield of light-induced chemical reactions (called photochemical reactions) measures the efficiency of the process. The quantum yield, f, is defined as:

for the reaction CH₃X → CH₃ + X is ϕ = 0.24. A cuvette containing a solution of CH₃X is irradiated with 280-nm light with a power of 885 mW for 10.0 minutes. Assuming total absorption of the light by the sample, what is the maximum amount (in moles) of CH₃X that breaks apart?

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number of reaction events number of photons absorbed Suppose the quantum yield