Question

An organic compound contains 69% carbon, 4.8% hydrogen and the remaining is oxygen. calculate the masses of carbon dioxide produced when 0.20g of substance is subjected to combustion.

• A. 0.40 g
• B. 0.50 g
• C. 0.60 g
  
• D. 0.70 g

Answer 1

Answer: (B)

0.50 g

Percentage of carbon in organic compound $=69\%$

So, 100 g of organic compound contains 69 g of carbon.

∴ 0.2 g of organic compound will contain $=\frac{69\times 0.2}{100}=0.138$ g of carbon

The molecular mass of carbon dioxide, $C{O}_2=44$ g

So, 12 g of carbon is contained in 44 g of $C{O}_2$.

0.138 g of carbon will be contained $=\frac{44\times 0.138}{12}=0.506$ g of carbon.

Thus, 0.506 g of $C{O}_2$ will be produced on complete combustion of 0.2 g of an organic compound.