1.

The number of water molecules in 1 litre of water is

Answer»

18
`18xx1000`
`N_(A)`
`55.55 N_(A)`

Solution :`d=M/V` (d = density, M = mass, V = volume)
Since `d=1`
So, `M=V`
18 GM = 18 ml
18 ml `=N_(A)` MOLECULES (`N_(A)=` AVOGADRO's no.)
`1000 ml=N_(A)/18xxx1000=55.555 N_(A)`


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