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A student obtains 3.45g of MgNH4PO4•6H2O from 3.00g of fertilizer. What is the actual %P in...

A student obtains 3.45g of MgNH4PO4•6H2O from 3.00g of fertilizer. What is the actual %P in the fertilizer?

I know the answer is 14.5% but can you please show the math and explain

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