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  3. Chemistry
  4. Volume of a gas at STP is 1.12 × 10-7 cc. Calculate the number of molecules in it

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Q. Volume of a gas at $STP$ is $1.12 \times 10^{-7}\, cc$. Calculate the number of molecules in it

Some Basic Concepts of Chemistry

Solution:

$\therefore 22400\, cc$ of gas at $STP$ has $6 \times 10^{23}$ molecules
$\therefore 1.12\times10^{-7}$ of gas at $STP$ has $\frac{6\times10^{23}\times1.12\times10^{-7}}{22400}$
$=3\times10^{12}$