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Q. The mass of a molecule of water is

Some Basic Concepts of Chemistry

Solution:

$6 \times 10^{23}$ molecules has mass $= 18\, g$
$1$ molecules has mass $=\frac{18}{6\times 10^{23}}$
$= 3 \times 10^{-23}g$
$= 3 \times 10^{-26} kg$