What is the phosphorus percentage of the monohydrate and the anhydrous material of MgNH4PO4.6H2O?

Monohydrate: MgNH4PO4*H20

MM of MgNH4PO4*H20= 173.28

MM of P=30.97

(30.97/173.28) *100 = 17.87%

Anhydrous:MgNHPO4

MM of MgNHPO4=137.29

MM of P= 30.97

(30.97/137.29) *100= 22.56%