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A hydrocarbon contains 10.5 g of carbon ...

A hydrocarbon contains `10.5 g` of carbon per gram of hydrogen. `1 L` of vapour of the hydrocarbon at `127^(@)C` and 1 atm pressure weighs `2.8 g`. Find the molecular formula of the hydrocarbon.

A

`C_(6)H_(8)`

B

`C_(7)H_(8)`

C

`C_(5)H_(12)`

D

`C_(8)H_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`PV (w)/(M_(w))RT`
`M_(w)=(wRT)/(PV)implies(2.8xx0.082xx400)/(1xx1)`
`M_(w)=91.84= 92 " " C_(7)H_(8)`
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