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Ar of O = 16g/mol
Mr of O2 = 2(16) = 32g/mol
Using the formula : Number of moles = mass / Mr
Number of moles = 40g / 32g/mol = 1.25mols
One mole of substance contains the same number of particles as the Avogadro constant, which is 6.02 x 10^23
Number of Oxygen molecules = 1.25 x 6.02 x 10^23 = 7.525 x 10^23
Each Oxygen molecules contain two Oxygen atoms
Number of Oxygen atoms = 7.525 x 10^23 = 1.505 x 10^24 atoms
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