Question

Calculate the molarity of pure water if its density at room temperature is 1.0 g/cm

Answer 1

Molarity = number of moles of solute / volume of solution

Mass of 1 litre = density of water × volume

= 1 kg/L × 1L

1 kg = 1000 grams

Mass of 1 kg of water = mass /molar mass

1000/18

= 55.56 litre