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

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Q. 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

NTA AbhyasNTA Abhyas 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

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

Number of moles of $CO_{2}=\frac{3.08}{44}=0.07$

So $x=0.07$

Number of moles of $H_{2}O=\frac{0.72}{18}=0.04$

So $y=0.08$

$x:y=7:8$

Therefore, empirical formula of hydrocarbon is $C_{7}H_{8}$ .