# Air Contains 23 Percent Of Oxygen And 77 Percent Of Nitrogen By Weight. What Is The Percentage Of Oxygen By Volume Is

Let the mixture of air be 100g.

Mass of Oxygen (O₂) in 100 g of air = 23 g

The molar mass of Oxygen = 32 g

If one mole of Oxygen occupies 22.4 L volume.

Then 23g of oxygen occupies =$$\frac{22.4}{32} * 23 = 16.1L$$

Mass of Nitrogen in 100 g of air = 77 g

The molar mass of Nitrogen (N₂) = 28 g

If one mole of Nitrogen occupies 22.4 L volume.

Then 77g of Nitrogen occupies = $$\frac{22.4}{28} * 77 = 61.6L$$

Now total volume of air = 16.1L + 61.6L = 77.7 L

The percentage of Oxygen =$$\frac{16.1}{77.7} * 100 = 20.7%$$

The percentage of Oxygen By Volume Is 20.7 percentage.

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