A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is:

Answers (1)

 General  equation for combustion of hydrocarbon :

C_{x}H_{y} + \left ( x + \frac{y}{4} \right ) O_{2} \rightarrow xCO_{2} + \frac{y}{2}H_{2}O

Number if moles of CO2 produced = 3.08 / 4 = 0.07

Number of moles of H2O produced = 0.72 / 18 = 0.04

So, 

\frac{x}{{y} } = \frac{0.07}{0.04} = \frac{7}{4}

The formula of hydrocarbon is C7H8.

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