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The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is
  • a)
    0.186 mol
  • b)
    0.21 mol
  • c)
    2.10 mol
  • d)
    0.0093 mol
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The number of moles of oxygen in one litre of air containing 21% oxyge...
Amount of O2 in 1 litre air = 21 % = 0.21 L .
∵ 22.4 L . of O2 = 1 mol
∴ 0.21 L of O2 = 1/22.4 x 0.21 mol = 0.0093 mol
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Most Upvoted Answer
The number of moles of oxygen in one litre of air containing 21% oxyge...
Calculation of moles of oxygen in one litre of air

Given:
Volume of air = 1 litre
Percentage of oxygen by volume = 21%
Standard conditions
We need to find the number of moles of oxygen in the given volume of air.

Step 1: Calculate the volume of oxygen in the given volume of air
The volume of oxygen in one litre of air can be calculated as follows:

Volume of oxygen = 21% of 1 litre
Volume of oxygen = (21/100) x 1 litre
Volume of oxygen = 0.21 litres

Step 2: Calculate the number of moles of oxygen
We know that one mole of any gas at standard conditions occupies a volume of 22.4 litres. Therefore, the number of moles of oxygen in 0.21 litres can be calculated as follows:

Number of moles of oxygen = Volume of oxygen / Volume occupied by one mole of gas at STP
Number of moles of oxygen = 0.21 litres / 22.4 litres per mole
Number of moles of oxygen = 0.0093 moles

Therefore, the number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is 0.0093 mol.
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The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, isa)0.186 molb)0.21 molc)2.10 mold)0.0093 molCorrect answer is option 'D'. Can you explain this answer?
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