2. In a sample of an organic compound weighing 2.499 mg, oxygen was quantitatively converted into CO2. Carbohydrate dioxide was dissolved in an electrolytic cell filled with a dilute alkali solution, and it was determined that the electrical conductivity of the absorption solution decreased Δkx=200*10-6 S/m. Standard substances containing from 200 to 1000 μg of oxygen were subjected to the same transformations, and the corresponding Δk values were measured. The measurement results are presented below:
mO2 in sample, µg 200 400 600 800 1000
Δk=200*106 80 150 220 285 355
Construct a calibration graph and calculate the mass fraction (%) of oxygen in the organic compound.

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