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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 litre of the vapour of the hydrocarbon 127°C and 1 atmosphere pressure weighs 2.8g. Find the molecular formula of the hydrocarbon.

A

`C_(3)H_(4)`

B

`C_(4)H_(6)`

C

`C_(7)H_(8)`

D

`C_(5)H_(7)`

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