28(1). In a sample of an organic compound weighing t (g), oxygen was quantitatively converted into CO2. Carbon dioxide was dissolved in an electrolytic cell filled with a dilute alkali solution, and LaeL was determined - a decrease in the electrical conductivity of the absorption solution. Standard substances containing from 200 to 1000 μg of oxygen were subjected to the same transformations, and the corresponding Lag values were measured. The measurement results are presented below:
mo2 in sample, µg 200 400 600 800 1000
∆χ•106, cm 80 150 220 285 355
Construct a calibration graph and calculate the mass fraction (%) of oxygen in the organic compound using the following data:
m, mg 2.299
ΔAe*106, cm 300

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