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Question
One litre of water has 6.02 × 1026 molecules. Estimate the size of a molecule.
Solution
The size of a particle (or molecule of matter is very small. 1 litre of water has 6.02 × 1026molecules, so the volume of a particle of water is
`(10^-3"m"^3)/(6.0 × 10^26)` = 1.6 × `10^-30 "m" ^3`.
Thus the diameter of a water molecule is nearly 1.27 × 10−9 metre.
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