4. A sample of an organic compound weighing 2.354 g was subjected to pyrolysis under conditions when the sulfur in the substance turns into hydrogen sulfide. The gaseous decomposition products after the chromatographic separation of cyan were passed into a conductometric cell containing a solution of mercury nitrate. As a result, the resistance of the solution in the cell increased to ΔRх. Standard samples were subjected to the same transformations, ΔR values ​​were measured and the following data were obtained:
mS in the sample, mg 0.240 0.260 0.280 0.300
ΔR•10-6, Ohm 450 480 510 540
Build a calibration graph and calculate the mass fraction (%) of sulfur in an organic compound if ΔRх= 494•106Ω.

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