Question

Calculate the morality of H2O in pure water​

Answer 1

The molecular weight of water is: 18.02 g/mol

The density of water is 1 g/ml

Therefore 1 litre of water (1,000 ml) would weigh 1,000 g

The molarity of something is the number of moles of that thing per 1,000 ml volume.

So, we have 1,000 g of water in 1 litre, the molecular weight is 18.02 g/mol

Hence, 1,000 / 18.02 = 55.49 Molar