Question

The number of water molecules in 1 litre of water is
A) 18 B)18 X 100
C)N D)55.55N

Explain it

Answer 1

Mass = Density * Volume = 1000 g/L * 1 L = 1000 grams

Now,
Number of moles = Given mass / Molar mass
= 1000 grams/18 = 55.55 moles

Now,
Number of molecules = Avogadro number* number of moles = 55.55 * N