1.

8c,c,of gaseous hydrocarbon requires 40c.c. of O_(2) for complete combustion. Identify hydrocarbon.

Answer»

Solution :VOLUME of hydrocarbon `=8c.c.`: Volume of`O_(2)=40c.c`
Formula No. `1, (8)/(40)=(2)/(3n+)` (For ALKANE)
`(1)/(5)=(2)/(3n+1)` or `3n+1=10` or `3n=10-1=9 , n=3`
The value of `n` COMES in whole number from `1st` formula it means hydrocarbon is alkane and it is of `3C` atom.
`therefore` Hydrocarbon is `C_(3)H_(8)` (Prospane)


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