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Question

Calculate the percentage of phosphorus in:
Calcium hydrogen phosphate Ca(H2PO4)2

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Solution

Relative molecular mass of Ca(H2PO4)2
=40.07+(1×4)+(30.9×2)+(16×8)
=40.07+4+61.8+128
=233.87
233.87gCa(H2PO4)2 contains 61.8gP
So, 100gCa(H2PO4)2 contains
100×61.8233.87=26.42g
The % of P in Ca(H2PO4)2 is 26.42%

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