Asked Oct 16, 2019

MgNH4PO4•6H2O loses H2O in a stepwise fashion as it is heated. Between 40 degrees celsius and 60 degrees celsius, the monohydrate is formed. What is the percentage of phosphorus in the monohydrate?
Enter your answer with 4 significant figures


Expert Answer

Step 1

MgNH4PO4.6H2O loses water in stepwise fashion and when the monohydrate is formed between 40°C and 60°C then there is only one molecule of water left as water of crystallisation.

Step 2

Monohydrate Formula = MgNH4PO4.H2O

Molecular mass of the monohydrate


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mass of (Mg+ N+ 4xH P 4x O+ mass of H,0) (24+14+4+31+4 x 16 +18)g = 155g

Step 3

Atomic weight of phosphorus= 31g

Percentage of phosphorus in monohydrate is calculat...


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mass of P percentage -x 100 mass of monohydrate 31 x100 155 20.00%


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