a. GMM of O2 = 2 × 16 = 32 g
b. No. of mole molecules = \(\frac{Mass}{GMM}\) = \(\frac{64}{32}\) = 2
Number of molecules = mole × 6.022 × 1023
= 2 × 6.022 × 1023
c. Number of atoms = Number of molecules × number of atoms in one molecules Number of atoms in one molecules of oxygen (O2) =2
∴ total number of atoms = 2 × 6.022 × 1023
= 4 x 6.022 × 1023