Question

calculate the number of atoms in 0.20 molecules of oxygen

Answer 1

No of atoms= 0.20/ 16
= 1/80 = 0.0125 no of atoms.
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Answer 2

∵ No. of molecules = moles × NA

∴ Moles = Molecules / NA
             = 0.20 / 6.02×10²³
             0.0332×10-²³

Now No. of atoms = moles × NA ×atomicity
                   
                             = 3.32×10  (power-25)×6.02×10²³ × 2

                             = 39.97 ×10 (power-2)