Question

Define molarity of pure water???????????

Answer 1

dear guys
It depends on the temperature. At 25 degrees Celsius and 1 atmosphere pressure.

One liter of water has a mass of 997.0480 kg. To convert this to molarity we need to know the molar mass of water and the volume of the liter.

The molar mass of water is 18.015 g/mol, and vlume = 1 liters.

Molarity = number of moles/ volume 

number of moles = 997.04 Kg/ 18 = 55.39 moles

Hence the Molarity  =  55.39/ 1 Liter

Hence molarity of water is 55.39 mole per Liter. 

I hope this help u

Answer 2

The density of water is approximately 1000 g/L and its molar mass is 18.02 g/mol (or 1/18.02=0.055 mol/g). Therefore, the molar concentration of water is: (H2O) = 1000 g/L / (18.02 g/mol) = 55.5 mol/L.