Question

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

Answer 1

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(a) Mole of Oxygen atoms = 0.2 mole

Molar mass of oxygen atoms = 16 g

Mass of oxygen atoms = 16 x 0.2 = 3.2 g

(b) Mole of water molecule = 0.5 mole

Molar mass of water molecules = 2 x 1 + 16= 18 g .

Mass of H2O = 18 x 0.5 = 9 g

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Answer 2

Explanation:

Ans. ∴ 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. Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.

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