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What is the mass of: (a) 0.2 mole of oxygen atoms? (b) 0.5 mole of water molecules?

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What is the mass of:
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?
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(a) Mass of 1 mole of oxygen = 16 g
Mass of 0.2 mole of oxygen = 0.2 × 16
= 3.2 g.
(b) Mass of 1 molecule of water = 18 gm.
Mass of 0.5 mole of water = 0.5 × 18
= 9 gm.

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