Question

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

• A. zero
• B. less than 1 % of 22.4 litres
• C. about 10% of the volume of container
• D. 1 % to 2% of 22.4 litres

Answer 1

Answer: (B)

We suppose that at $4^{\circ }C$ (when water has maximum density) there is no empty space between the molecules of water $=18mL$
Volume of $1$ mol water vapours at $S.T.P$
$=22400mL$
Percentage of volume occupied
$=\frac{18}{22400}\times 100$
$=0.08\%$
Thus volume actually occupied is less than $1$