Question

Number of water molecules in 1 litre of water

1)18 . 2)181000 3)N⁴ . 4)55.55 NA

Answer 1

option 4 is correct.

The density of water is 1 kg/L
​1 liter of water has mass about 1 kg or 1000 grams.

Molar mass of water=18 g/mol

So, Number of moles of water in 1 L= 1000/18= 55.55 moles