A gaseous compound is composed of 85.7% ...

A gaseous compound is composed of `85.7%` by mass of carbon and `14.3%` by mass hydrogen. Its density is 2.28 g/L at 300 K and 1 atm pressure. Determine molecular formula of the compound.

`C_2H_2`

`C_2H_4`

`C_4H_8`

`C_4H_10`

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