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Question

# A compound contains 6.4% by mass of oxygen. What is the minimum molar mass of the compound?

A
500 gmol1
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B
250 gmol1
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C
333.33 gmol1
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D
125 gmol1
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Solution

## The correct option is B 250 gmol−1If we take the basis as 100 g of the compound, 6.4% by mass oxygen means that it contains 6.4 g of oxygen. The compound has to have at most 1 atom of oxygen for us to find out the minimum molar mass. So, 1 atom or 16 g of oxygen is present which is 6.4% of the molar mass of compound. 6.4100×M=16 gmol−1 where, M is the molar mass of compound So, M=250 gmol−1

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