Question

State which has higher no. of atoms : 1 g of O2 or 1 g of Cl2 [O = 16, Cl = 35.5]

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Answer

Molecular mass of O2 = 2 × 16 = 32 g

32 g of O2 = 2 × 6.023 × 1023 atoms

∴ 1 g of O2 = 2 × 6.023×10^{23}\over 32

Molecular mass of Cl2 = 2 35.5 = 71 g

71 g of Cl2 = 2 6.023 1023 atoms

∴ 1 g of Cl2 = 2 × 6.023×10^{23}\over 71

Hence, 1 g of O2 has more number of atoms.

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