1.

A gaseous hydrocarbon has 85%C and its vapour density is 28. The possible formula of the compound is

Answer»

`C_(3)H_(6)`
`C_(2)H_(2)`
`C_(3)H_(8)`
`C_(4)H_(8)`

SOLUTION :`%C=85`, `%=H=15`
`{:("Element","Percentage","Mole","Mole ratio"),(C,85,85//12=7.08,1),(H,15,15//1=15,2):}`
Empirical formula `=CH_(2)`
Empirical formula mass `=12+2=14`
Molecular mass `=28xx2=56`
`n=(56)/(14)=4`
Molecular formula `=(CH_(2))_(4)=C_(4)H_(8)`


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