Question

 Calculate the molarity of pure water (d = 1 g mL^-1).

Answer 1

Desity of water = 1 g mL^-1

Mass of 1000 ml of water = V xd

 = 1000 mL x 1 gm^-1

= 1000 g

 Moles of water 1000/18= 55.55 mol

 Now, mole of H₂ O present in 1000 mL or 1 L of water. 

So, molarity = 55.55M