Periоdic Tаble.pdf Mаss = Mоles x Mоlаr Mass M = moles/Litres 1 mole = 6.02 x 1023 particles a) how many moles are there in 1.34 x 1018 molecules of H2O? b) what is the mass of 3.7 moles of NaOH? c) how many particles are there in 14 moles of O2? d) what is the mass of 3.5 x 1023 particles of H2O?