312. A sample of a natural product weighing m (g) was dissolved in V (ml) of alcohol and 0.05 ml of the solution was applied to paper. After chromatographic separation, the resulting spots of uridylic acid, ribose-1,5-diphosphate, and adenylic acid were excised and fused with KOH and K2S2O8; after the dissolution of the melt, phosphorus was determined photometrically, obtaining the values of the optical density of Aurid, Arib and Aadenil, respectively; from a standard phosphate solution containing 20 μg R/ml, a solution was prepared with an optical density Ast. Determine the percentage of these derivatives in the natural product.

Problem m, g V, ml Aurid Arib Aadenil Ast
312 0.879 100 0.55 0.76 0.20 0.90

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