1.

The carbon, hydrogen and oxygen in an organic compound have been found to be in the ratio of 3: 4 : 4. If the vapour density of the compound is 104, its molecular formula is :

Answer»

`C_(43)H_(4)O_(4)`
`C_(3)H_(4)O_(2)`
`C_(9)H_(12)O_(12)`
`C_(6)H_(8)O_(8)`

Solution :The empirical formula , `C_(3)H_(4)O_(4)`
Empirical formula mass `=3xx12+4xx1+4xx16=104`
Molecular mass `=2xxV.D`
`=2xx104=208`
`n=(208)/(105)=2`
Molecular formula `=(C_(3)H_(4)O_(4))_(2)`
`=C_(6)H_(8)O_(8)`


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