A hydrocarbon contains 85.7 % C. If 42 m...

A hydrocarbon contains 85.7 % C. If 42 mg of the compound contains `3.01xx10^(20)` molecules, the molecular formula of the compound will be ......

`C_(3)H_(6)`

`C_(6)H_(12)`

`C_(12)H_(24)`

`C_(2)H_(4)`

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The correct Answer is:

A, B, C

Mass of `3.01xx10^(20)` atoms `=42xx10^(-3)g`
`:.` Mass of `6.02xx10^(23)` atoms `=84g`
`:.` Molecular formula : `C_(6)H_(12)` (C of 85.7)

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