college chemistry

From your mass of MgNH4PO4.6H2O collected, calculate your value

a) for the mass of "P2O5" in the initial mass of fertilizer analyzed
b) the % "P2O5" in the fertilizer. Compare this with the manufacturer's specification.

Just want to know how i would go about this question, where would I start.

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  1. mass P2O5 = mass MgNH4PO4.6H2O x (molar mass P2O5/2*molar mass MgNH4PO4) = ?

    %P2O5 = (mass P2O5)/mass sample)*100 = ?

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