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Q.
In a mole of water vapours at STP, the volume actually occupied or taken by the molecules (i. e., Avogadro's No. x volume of one molecule) is
Some Basic Concepts of Chemistry
Solution:
We suppose that at $4^{\circ}C$ (when water has maximum density) there is no empty space between the molecules of water $=18\,mL$
Volume of $1$ mol water vapours at $S.T.P$
$=22400\,mL$
Percentage of volume occupied
$=\frac{18}{22400}\times100$
$=0.08\%$
Thus volume actually occupied is less than $1\ %$