Question

The empirical formula of a compound is $C{H}_{2}O$. If the molecular weight of the compound is $180$, the molecular formula is:

• A. $C_6{H}_{12}{O}_6$
• B. $C_3{H}_6{O}_3$
• C. $C_4{H}_8{O}_2$
• D. $C_5{H}_{10}{O}_5$

Answer 1

The correct option is A $C_6{H}_{12}{O}_6$

The empirical formula is $C{H}_{2}O$. Therefore, the empirical weight $=$ $30$.
Given, the molecular weight $=180$ g.
$x=\frac{\text{Molecular weight}}{\text{Empirical weight}}=\frac{180}{30}=6$
$\text{Molecular Formula}=(\text{Empirical Formula}{)}_x$
$\therefore \text{Molecular Formula}=(C{H}_{2}O{)}_6=C_6{H}_{12}{O}_6$