Question

How many moles of oxygen is present in 48g of O2

Answer 1

or the rest of the atoms on the periodic table, their molar mass tells you how many grams of each you need to have a mole of those atoms, or 6.02×1023 atoms of that element. If oxygen has 1 mole, it will have 6.02×1023

and o2 is diatomic molecule so 48*2*6.02*1023

solve it and you will get the answer