Question

calculate molarity or pure water if density is 1gm/ml

Answer 1

 If density of water is 1gm/ml then weight of waterpresent in one litre of water is 1000 grams. So number of moles will be 1000/18 moles which is equal to 55.55 moles. Definition of molarity is number of moles of solute present in one litre of solvent.