Question

The number of mole of oxygen in one litre of air containing 21% oxygen by volume,under standard conditions,is​

Answer 1

Answer:

26.5 moles.

Explanation:

21 % of 1 litre is 210 ml. If we consider the density of water 1 g/cm^3, then 210 ml water has a mass of 210 grams.

The atomic mass of oxygen is 16 u.

So, number of moles is equal to,

$\frac{210}{8} = 26.5$

That makes 26.5 moles of oxygen.