Question

Molar concentration of a solution in water is

Answer 1

The density of water = 1000 g/dm3.
The molecular mass of H2O = (21 g/mol) + (116 g/mol) = 18 g/mol.
Concentration mol/dm3 = 1000 g/dm3 / 18 g/mol ~ 55.5 mol/dm3.