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Question

A compound contains 12.8% by mass of oxygen. It contains two moles of oxygen per mole of the compound. What is the  molar mass of the compound?


Your Answer
A
1000 g/mol
Your Answer
B
500 g/mol
Correct Answer
C
250 g/mol
Your Answer
D
100 g/mol

Solution

The correct option is C 250 g/mol
If we take the basis as 100 g of the compound, 12.8% by mass oxygen means that it contains 12.8 g of oxygen.

2 oxygen atoms per atom are present in 1 molecule of the compound, then 32 g is present in molar mass 'g' of the compound.
Molar mass of the compound =
12.8100×M=32 g mol1
where, M is the molar mass of compound

So,  M=250 g mol1

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