Question A 0 141g sample of a phosphorus containing compound was digested in a mixture of HNO3 and H SO4 which resulted in

Question

Question A 0 141g sample of a phosphorus containing compound was digested in a mixture of HNO3 and H SO4 which resulted in formation of CO H O and H PO4 Addition of ammonium molybdate yielded a solid having the composition NH4 3 PO4 12 MoO3 The precipitate was filtered washed and dissolved in 50 0 mL of 0 20M NaOH 56 57 58 NH4 3PO4 12 MoO3 s 260H HPO 2 12M002 14H O 3NH g After boiling the solution to remove the NH3 the excess NaOH was titrated with 14 1 mL of 0 174M HCI The reacted milli moles of NaOH with solid having composition NH4 3PO4 12 MoO3 is A 7 55 B 5 75 C 6 65 D 8 25 Produced mole of NH3 is A 7 62 x 10 3 B 8 71 x 10 4 C 6 85 10 3 The percent of phosphorous in the given sample is B 5 56 A 3 36 C 6 38 D None of these D 7 25

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