The quantum yield of light-induced chemical reactions (called photochemical reactions) measures the efficiency of the process. The quantum yield, ϕ, is defined as:ϕ=number of reaction events/number of photons absorbed. Suppose a quantum yield for the reaction CH3X→CH3+X is ϕ = 0.74. A cuvette containing a solution of CH3X is irradiated with 280-nm 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?