Question

The empirical formula of a compound is $CH_2O$. Its molecular weight is $180$. The molecular formula of the compound is

• A. $C _{4} HO _{4}$
• B. $C _{5} H _{10} O _{5}$
• C. $C _{3} H _{6} O _{3}$
• D. $C _{6} H _{12} O _{6}$

Answer 1

Answer: (D)

Let's find the Molar mass of Carbon $=12$.
Molar mass of Hydrogen $=1$.
Molar mass of Oxygen $=16$.
Mass of $CH _{2} O =12+2(1)+16=30$.
Molecular weight of compound given is 180 .
So, the molecular weight is $\frac{180}{30}=6$.
$\Rightarrow$ Molecular formula of compound is $C _{6} H _{12} O _{6}$.