Question

The number of moles of oxygen in 1 litre of air containing 21 oxygen by volume

Answer 1

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

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