Question

1.6 g of an organic compound on combustion gave 4.4 g carbon dioxide. The % of carbon in the organic compound is:

• A. 30
• B. 45
• C. 60
• D. 75

Answer 1

The correct option is A 30

The atomic mass of carbon is 12.

Weight of carbon in the 4.4g $C{O}_2$ is

$=\frac{12\times 4.4}{44}=1.2$ grams.

So the mass of carbon in the compound was 1.2 grams.

The % mass of C in the compound of the total weight 1.6g is

$\frac{1.2}{1.6}\times 100=75$ %

The % of carbon in the compound = 75%.

Hence, the correct option is $D$