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Question

A carbon compound containing carbon and oxygen has approximate molar mass equal to 290. On analysis it is found to contain 50% by mass of each element. Therefore molecular formula of the compound is

A
C12O9
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B
C4O3
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C
C3O4
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D
C9O12
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Solution

The correct option is A C12O9
Let the mass of the compound = 100 g
mass of oxygen = 50 g
moles of oxygen= 5016
mass of carbon = 50 g
moles of carbon= 5012
mole ratio of carbon to oxygen= 5012:5016=4:3

empirical formula =C4O3
Empirical mass =96
And let molecular formula is (C4O3)n
96n=290
or n=290963
molecular formula is C12O9

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