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Q. Total number of atoms present in $64 \, gm$ of $SO _{2}$ is-

Some Basic Concepts of Chemistry

Solution:

$SO _{2} \rightarrow$ Contain 3 atom

$n =\frac{\text { wt. }}{\text { M.wt. }}=\frac{64}{64} \times 3 N _{ A } $

$=3 \times 6.02 \times 10^{23}$