What is the molar concentration of a solution of pure water?
Concentration (mol/dm3) = (density (g/dm3)) / (molecular mass (g/mol))
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
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Answered by Joshua D. • Oxbridge Preparation tutor
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