5. Solving a chemistry problem

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34(3). From a sample of methylene chloride CH2Cl2 weighing 20.00 g, 100.0 ml of a solution in chloroform was prepared to build a calibration graph. V ml of this solution was added to volumetric flasks with a capacity of 50.0 ml and brought to the mark with chloroform. The baseline method at 7.98 μm found the values of A = -lg * I / Io, below:
V, ml 2.00 4.00 6.00 8.00 10.00
A 0.085 0.155 0.225 0.300 0.375
Calculate the concentration (g / l) of methylene chloride in the test solution, if after diluting 25.0 ml with chloroform to 50.0 ml, the following values \u200b\u200bof A \u003d 0.125 are found

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