4. The value of the molar absorption coefficient of a solution of iron monosulfosalicylate is 1.6 * 103 l / cm * mol. Calculate what should be the content of iron, mg/cm3, in standard solutions, in prepared volumetric flasks with a capacity of 100 cm3, so that the optical densities during measurements in cuvettes with a layer thickness of 1 cm fall within the range of values from 0.1 to 1.0.

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