Question

0.246 g of an organic compound on complete combustion gave 0.198 g of carbondioxide and 0.1014 g of water, then the percentage composition of carbon and hydrogen in the compound respectively
1) 4.58, 21.95 2) 21.95, 4.58
3) 45.8, 2.195 4) 2.195, 45.8

Answer 1

The correct options is B

in the given question

mass of organic compound=0.246 g

mass of carbon dioxide= 0.198 g

mass of water= 0.1014 g

mass of water=0.1014 g

% of carbon:

$\frac{12}{44}\times \frac{0.198}{0.246}\times 100$

=21.95%

% of Hydrogen

$\frac{2}{18}\times \frac{massof{H}_{2}O}{massofcompound}\times 100$

$\frac{2}{18}\times \frac{0.1014}{0.246}\times 100$

=4.58%