Question

the number of moles of oxygen in 1 litre of air containing 21% oxygen by volume in standard conditions is

Answer 1

At standard conditions, 1 liter of air at 21% oxygen possesses 0.21 L of oxygen. Since at STP 1 mole of gas occupies 22.4 L, simply divide 0.21/22.4, to arrive at0.0094 moles of oxygen.

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Answer 2

There is 21% of Oxygen present in 1 Litre of air.

So the total amount of Oxygen is,

=(1x21/100)L

=0.21 L

In Standard pressure and temperature(STP);

1 mole of gas is 22.4 litres in volume,

So the total number of moles present in 0.21 litre is

=(0.21 x 1/22.4)mole

=0.009375 mole

=0.0094 mole (approximate)