Question

On complete combustion, $0.1$ g of an organic compound gave $0.176$ g of carbon dioxide and $0.18$ g of water. The percentage composition of carbon and hydrogen in the compound respectively is :

• A. $48\%,20\%$
• B. $20\%,48\%$
• C. $68\%,30\%$
• D. $30\%,68\%$

Answer 1

Answer: (A)

$48\%,20\%$

% of $C$ $=12\times 0.176/44=0.048$ gm in $0.1$ gm,

i.e., $48$% $C$.
% $H$ $=2\times 0.18/18=0.02$ gm in $0.1$ gm,

i.e., $20$% $H$.