4. To determine molybdenum by reaction with dithiol, the calibration curve should cover the range of optical densities from 0.15 to 1.50. Calculate the portion of MoO3 that must be dissolved in 25 ml of alkali so that the optical density of the samples taken with a volume of 1-10 ml diluted to 50 ml is 0.15 - 1.50 with a cuvette layer thickness of 1 cm and a molar light absorption coefficient of the colored compound of 1.3 * 104.

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