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  4. Number of water molecules in the drop of water, if 1 mL of water has 20 drops and A is Avogadro's number, is

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Q. Number of water molecules in the drop of water, if $1 \,mL$ of water has $20$ drops and $A$ is Avogadro's number, is

Some Basic Concepts of Chemistry

Solution:

1 mole i.e. $18 \,g$ contains $=A$ molecules

For water, density $=1 g / mL$

Thus $18 \,g \equiv 18 \,mL$

$1 mL$ (or 20 drop) will contain $=\frac{A}{18}$ molecules

$1$ drop will contain $=\frac{A}{18} \times \frac{1}{20}=\frac{0.05 A}{18}$ molecules