A gaseous compound is composed of 85.7% ...

A gaseous compound is composed of `85.7%` by mass carbon and `14.3%` by mass hydrogen. Its density is `2.25` g/litre at `300 K and 1.0` atm pressure. Determine the molecular formula of the compound.

`C_(2)H_(2)`

`C_(2)H_(4)`

`C_(4)H_(6)`

`C_(4)H_(10)`

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