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Answer :
(a) Mass of 1 mole of oxygen atoms = 16u
∴ Mass of 0.2 moles of oxygen atoms = 0.2 × 16 = 3.2u
(b) Mass of 1 mole of water molecules = 18u
∴ Mass of 0.5 moles of water molecules = 0.5 × 18 = 9u