141. Solving a chemistry problem

In a sample of an organic compound weighing m g, oxygen was quantitatively converted to CO2. The carbohydrate dioxide was dissolved in an electrolytic cell filled with a dilute alkali solution, and dNx was determined - a decrease in the electrical conductivity of the absorption solution
The same transformations were carried out with standard substances containing from 200 to 1000 μg of oxygen, and the corresponding values ​​of dNx were measured. The measurement results are presented below:
Oxygen content in the sample, μg 200 400 600 800 1000
dNx * 10 ^ 6, cm 80 150 220 285 355
Construct a calibration graph and calculate the mass fraction (%) of oxygen in an organic compound using the following data:
Option 1
m, mg 2.299
dNx * 10 ^ 6, cm 300