107. In the spectrophotometric determination of element X in the form of a complex compound R with a reagent, the optical density of a solution containing m X in 50 ml of an organic was found to be equal to A. The measurement was carried out in a cuvette with a layer thickness of l under certain conditions. Calculate the value of the molar absorption coefficient of the complex.
X R m(X), mg A l, cm
Pb2 complexone 0.025 0.643 3

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