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  4. Volume of a gas at STP is 1.12 × 10-7 cc.Calculate the no. of molecules in it

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Q. Volume of a gas at STP is $1.12 \times 10^{-7}$ cc.Calculate the no. of molecules in it

Some Basic Concepts of Chemistry

Solution:

No. of molecules $=\frac{1.12\times10^{7}}{22,400}g$
$=\frac{10^{-9}}{200}$
$=0.5\times 10^{-11}$ moles
$=0.5\times10^-{11}\times6.02\times10^{23}$
$=3.01\times 10^{12}$ molecules