• # question_answer The molarity of pure water at $4{}^\circ C$is A) 1 M B) 2.5 M C) 5 M D) 55.5 M

The density of water is $1\,g\,c{{m}^{-3}}$ at 4°C so molarity$=\frac{1000}{18}=55.5\,M$.