What is the mass of:
(a) 0.2 mole of oxygen atom?
(b) 0.5 mole of water molecules?
(a) Mass of 1 mole of oxygen atoms = 16u
\(\therefore \) Mass of 0.2 moles of oxygen atoms = 0.2 × 16 = 3.2u
(b) Mass of 1 mole of water molecules = 18u
\(\therefore \) Mass of 0.5 moles of water molecules = 0.5 × 18 = 9u
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