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Question

In diammonium phosphate (NH4)2HPO4, the percentage of P2O5 is :

A
35.87
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B
46.44
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C
51.99
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D
53.78
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Solution

The correct option is B 53.78
Molar Mass of Diammonium Phosphate (NH4)2HPO4 is 28+8+1+31+64=132 grams
Molar Mass of P2O5 is 62+80=142 grams
We know that 2 moles of diammonium hydrogen sulphate yields 1 moles of P2O5 i.e 2(NH4)2HPO4P2O5
Mass of 2 moles of P2O5=2×132 grams=264 grams
Therefore, percentage composition of P2O5=Mass of P2O5Mass of 2 moles of (NH4)2HPO4
=142264×100=53.78%

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