A gaseous hydrocarbon gives upon combust...

A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of `CO_(2).` The empirical formula of the hydrocarbon is:

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18 g `H_(2)O` contains 2gH
`:. 0.72 g H_(2)O "contains" 0.08 gH`
44 g `CO_(2)` contains 12 gC
`:. 3.08 g CO_(2)` contains 0.84 gC
`C : H = 0.84/12 : 0.08/1 = 0.07 : 0.08 = 7 : 8`
Empirical formula = `C_(7)H_(8)`

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