Question: > A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g. of CO2. The empirical form...

Question

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

Answer 1

Solution

(4)

18g H2O contains 2g H

$\therefore$ 0.72 g H2O contains 0.08 gH.

44 g CO2 contains 12g C

$\therefore$ 3.08 g CO2 contains 0.84 g C

$\therefore$ C : H = $\frac{0.84}{12}:\frac{0.08}{1}$ = 0.07 : 0.08

= 7 : 8

$\therefore$ Empirical formula = C7H8