What is the mass of 0.2 mole of oxygen atoms?
Molar mass of oxygen atom(O) = 16g
Number of moles present = 0.2 mole
As we know that, Number of moles = G mass of an element/molar mass of an element
Hence mass of an element = No. of moles X molar mass of an element.
Mass of oxygen atoms = 0.2×16 = 3.2g