141. Solving a chemistry problem

A weighed portion of an organic compound weighing m g was subjected to pyrolysis under conditions when the sulfur in the substance transforms into hydrogen sulfide. Gaseous decomposition products after chromatographic separation of cyanogen were passed into a conductometric cell containing a solution of mercury nitrate. As a result, the resistance of the solution in the cell increased by
dRx.
Standard substances with known sulfur content were subjected to the same transformations and the corresponding dR values ​​were measured. The measurement results are shown below.
Sulfur content in the sample, mg 0.240 0.260 0.280 0 300
etc.R. cm 450 480 510 540
Build a calibration graph and calculate the mass fraction (%) of sulfur in the organic compound according to the following data:
Option 1
m. mg 1.315
дRx, cm 430