A hydrocarbon contains 81.8% by weight of carbon. Empirical formula of the hydrocarbon is

	C	H
Percentage by weight	$81.8 \mathrm{g}$	$18.2 \mathrm{g}$
Number of g atoms	$\frac{81.8}{12}=6.82$	$\frac{18.2}{1}=18.2$
Number of g atoms	$\frac{6.82}{6.82}=1$	$\frac{18.2}{6.82}=2.66$
Number of g atoms	$1\times 3=3$	$2.66 \times 3 =8$