39. A sample of 1.00 g of superphosphate was treated with water. 17.6 cm3 of NaOH solution with titer TNaOH / P2O5 = 0.007251 g/cm3 was used for titration of the filtrate until the transition of H3PO4 to NaH2PO4. Calculate the percentage of P2O5 in superphosphate.

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