Question

The number of mole of oxygen in one litre of a containing $21\%$ oxygen by volume, under standard conditions, is?

• A. $0.0093mole$
• B. $2.10moles$
• C. $0.186mole$
• D. $0.21mole$

Answer 1

The correct option is A $0.0093mole$

I L air $\Rightarrow$ 210ml oxygen

$\therefore n=\frac{210}{22.4\times {10}^3}$

$\approx 0.0093mol$