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Question

# A compound contains 6.4% by mass of oxygen. It contains two moles of oxygen atoms per mole of the compound. What is the molar mass of the compound?

A
500 g mol1
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B
525 g mol1
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C
333.33 g mol1
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D
125 g mol1
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Solution

## The correct option is A 500 g mol−1If we take the basis as 100 g of the compound, 6.4% by mass of oxygen means that it contains 6.4 g of oxygen. 2 oxygen atoms are present in 1 molecule of the compound. Then, 32 g of oxygen will be present in one gram mole of the compound. Let molar mass of the compound be M. ∴ 6.4100×M=32 g mol−1 ⇒M=500 g mol−1

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