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
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