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The precipitate you have formed is MgNH4PO4.6H2O. The mass of the MgNH4PO4.6H2O precipitate is 10.854g. The mass of the plant food is 5.262g. The available P2O5 is 30%. A) Calculate its formula weight B) From this formula and the mass of the precipitate you obtained, calculate the number of grams of phosphorus, P in the plant food.t) C) From the number of grams of phosphorus, calculate the number of grams of P2O5 in the plant food. D) Calculate the % P2O5 in the plant food. How does your value compare with the value listed on the plant food label?