The molecular weight of water is 18 daltons. What is the molarity of 1 liter of pure water? 14:37 Biology Chapter 3 The molecular weight of water is 18 daltons. What is the molarity of 1 liter of pure water? A) 55.6M B) 18M C) 37M D) 0.66M E) 1.0M Answer: A) 55.6M Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+