115. A weighed portion of a substance of mass m1 was dissolved in a flask of capacity V1. To plot a calibration graph, Vn of this solution was placed in measuring flasks of capacity V2, reagents were added, and the solution was brought to the mark. The optical densities were measured relative to the first solution. A weighed portion of the analyzed sample of mass m2 was dissolved in a flask of capacity V3. An aliquot V4 was placed in a measuring flask V5, reagents were added, and the solution was brought to the mark. The relative optical density was measured as when plotting a calibration graph. Calculate the mass fraction (%) of substance X in the samples. option x m1 g v1, ml v2, ml m2, g v3, ml v4, ml v5, ml
1 Mn 1.2500 1000.0 250.0 3.5000 1000.0 50.00 250.0
2 Si 0.0375 500.0 100.00.2500 500.0 5.00 100.0
3 P2O5 0.5046 1000.0 50.0 0.3000 250.0 20.00 50.0

Data for plotting the calibration graph
Vn, ml 5.20 5.40 5.60 5.80 6.00
A,rel, 0.105 0.215 0.330 0.440 0.550
A,rel,x=0.270

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