Some Basic Concepts Of Chemistry Question 39
Question: The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard conditions are
Options:
A) 0.0093 mole
B) 0.21 mole
C) 2.10 mole
D) 0.186 mole
Show Answer
Answer:
Correct Answer: A
Solution:
[a] 21% of 1 litre is 0.21 litre. 22.4 litres = 1 mole at STP
$ \therefore 0.21 $ litre $ =\frac{0.21}{22.4}=0.0093 $ mol
