Question

What is the molarity of pure water?

Answer 1

Molarity of pure water=55.55 M

At 25℃, density of water=1 gram/ml

1 g=1 ml

So, 1000 g=1000 ml

Number of moles of water=$\frac{1000g}{18g}mol=55.55mol$

Molarity of water=$\frac{n}{V}=\frac{55.55mol}{1L}=55.55M$