Question

The empirical formula and molecular mass of a compound are $C{H}_{2}O$ and $150g/mol$ respectively. The molecular formula of the compound can be given as $C_x{H}_y{O}_x$. The value of ' $x$ ' is________.

Answer 1

Answer: 5

Given: Empirical formula $=C{H}_{2}O$
Empirical formula mass $=1\times 12+2\times 1+16\times 1$
$=30g$
Molecular mass $=150g$
Molecular formula $=n\times$ empirical formula
$n=\frac{\text{ Molecular mass }}{\text{ Empirical formula mass }}=\frac{150}{30}=5$
$\therefore$ Substituting the value of $n$ in equation (i),
Molecular formula of
$C_x{H}_y{O}_x=5\times$ empirical formula
$=5\times C{H}_{2}O=C_5{H}_{10}{O}_5$
Hence, $x=5$