37. The number of moles of oxygen in one litreair containing 21% oxyge

1.	37. The number of moles of oxygen in one litreair containing 21% oxygen by volume, undstandard conditions, is(a) 0.0093 mol(c) 0.186 mol(b) 2.10 mol(d) 0.21 mol.
Answer» 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 option a

37. The number of moles of oxygen in one litreair containing 21% oxygen by volume, undstandard conditions, is(a) 0.0093 mol(c) 0.186 mol(b) 2.10 mol(d) 0.21 mol.

Answer»

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

option a