Question

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

Answer 2

Answer:

0.0093 mol

So, we can now say the number of moles of oxygen in 1 L of air containing 21% oxygen by volume, in standard conditions, is 0.0093 mol. So, the correct answer is “Option D”. Note: The standard conditions refer to the STP conditions where the temperature is 273.15K and 1 atm pressure.

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