What is the mass of 1 mole of #O_2# molecules? Chemistry The Mole Concept The Mole 1 Answer Kris Caceres Jan 18, 2016 #31.9988 g# Explanation: To obtain the mass of 1 mole #O_2# molecule, you simply have to multiply it to its molecular weight which is #31.9988 g/[mol]#. g #O_2 = 1 mol O_2 * (31.9988 g/[mol O_2])# g #O_2 = 31.9988# Answer link Related questions How do you calculate the number of moles from volume? How do you convert grams to mole? Question #258e5 Question #8d48c Why is the mole an important unit to chemists? What's the mole number? How does the mole relate to carbon 12? How does the mole relate to molecules and ions? How do you calculate the moles of a substance? How can I calculate the moles of a solute? See all questions in The Mole Impact of this question 1458 views around the world You can reuse this answer Creative Commons License