Chemistry
Grade-9
Easy
Question
What is the percentage composition of P2O5 in diammonium hydrogen phosphate is:
- 53.78
- 57.38
- 55.38
- 54.38
Hint:
For one mole of diammonium hydrogen phosphate, 0.5mole P2O5 is present.
The correct answer is: 53.78
The chemical formula of diammonium hydrogen phosphate is (NH4)2HPO4.
Molecular weight of diammonium hydrogen phosphate is 132g. For one mole, 0.5mole P2O5 is present. Mass of P2O5 is 142g, o5 mole mass is 71g.
the percentage composition of P2O5 in diammonium hydrogen phosphate = (71
132)
100% = 53.78%
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