seven moles

What Is The Mass Of 3 Moles Of Oxygen Gas? 3 moles of Oxygen atoms weigh 48.00 grams. How many atoms are in 3 moles of O2? Explanation: 1 mole of a substance there are 6.022*10^23 atoms/molecules. From this we can deduce that there are 3*6.022*10^23 O2 molecules in 3 moles. What is the mass