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  4. An unknown amino acid has 0.032 % sulphur by wt. If each molecule has one S atom only, 1 g. of amino acid has molecules :

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Q. An unknown amino acid has $0.032\%$ sulphur by wt. If each molecule has one $S$ atom only, $1 \,g$. of amino acid has ______ molecules :

Some Basic Concepts of Chemistry

Solution:

Mass of $S =1 \times \frac{0.032}{100}$
$=3.2 \times 10^{-4} g$
mol of $S =\frac{3.2 \times 10^{-4}}{32}$
$=10^{-5} mol ( mol$ of amino acid)
molecules of amino acid $=10^{-5} \times N _{ A }$
$=6.023 \times 10^{18}$ molecules