0.54g of an organic compound containing phosphorous gave 0.888 g of Mg2P2O7 by the usual analysis. Calculate the percentage of phosphorous in the compound.
A
85.4%
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B
45.88%
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C
27.2%
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D
12.8%
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Solution
The correct option is C 45.88%
The mass of the compd = 0.54 g
Mass of Mg2P2O7 = 0.88 g
Since 1 mole of Mg2P2O7 has 2 g atoms of P, or
222 g of Mg2P2O7 = 62 g of P
So, 0.88 g of Mg2P2O7 contains P = 62/222 x 0.88 g
So % P present in the compound = 62/222×0.88×100/0.54