Question

An organic compound has the empirical formula $C{H}_{2}O$ vapor density of that compound is 90. Find out the molecular formula of the compound. Calculate the percentage composition of carbon, hydrogen, and oxygen respectively of that compound.

• A. 30, 12.66, 57.33
• B. 40, 6.66, 53.33
• C. 53.66, 6.66, 39.66
• D. 50, 8.66, 41.33

Answer 1

The correct option is B 40, 6.66, 53.33

mass of $C{H}_{2}O$ = 12+2+16 = 30g

Calculating the percentage composition of Carbon =

$\frac{12}{30}\times 100$ = 40 %

Calculating the percentage composition of Hydrogen =$\frac{2}{30}\times 100$ = 6.66 %

Calculating the percentage composition of Water = $\frac{16}{30}\times 100$ = 53%

answer is B