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Question

# 1.6 g of an organic compound gave 2.6 g of magnesium pyrophosphate. The percentage of phosphorus in the compound is:

A
45.38%
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B
54.38%
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C
37.76%
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D
19.02%
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Solution

## The correct option is C 45.38%Mass of Phosphorous = 31uSince 1 mole of Mg2P2O7 has 2g atoms of PMass of Phosphorous in Mg2P2O7 = 62uMass of Mg2P2O7 = 222.5uWeight of Mg2P2O7 = 2.6gWeight of organic compound = 1.6gPercentage of phsphorous=Mass of phsphorousMass of Mg2P2O7×Weight of Mg2P2O7Weight of organic compound×100Percentage of phsphorous=62222.5×2.61.6×100=45.38%Hence, A is correct answer.

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