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Some Basic Concepts of Chemistry
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11/08/2021 10:54 am
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The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard conditions are
(a) 0.0093 mole
(b) 0.21 mole
(c) 2.10 mole
(d) 0.186 mole
1 Answer
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11/08/2021 10:56 am
Correct answer: (a) 0.0093 mole
Explanation:
21% of 1 litre is 0.21 litre.
22.4 litres = 1 mole at STP
∴ 0.21 litre = \(\frac{0.21}{22.4}\)
= 0.0093 mole