Question

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

Answer 1

ANSWER

∴ 0.2 mole of oxygen atoms = 16 × 0.2 = 3.2 g (b) 1 mole of water molecules = 18 g ∴ 0.5 mole of water molecules = 18 × 0.5 = 9 g 10.

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Answer 2

Explanation:

(a)

Mass of one mole of oxygen atoms = 16 g

Then, mass of 0.2 mole of oxygen atoms = 0.2 x 16g = 3.2 g

(b)

Mass of one mole of water molecule = 18 g

Then, mass of 0.5 mole of water molecules = 0.5 x 18 g = 9 g