Question

26. Calculate the volume of nitrogen, oxygen and carbon dioxide in 750 L of air.

Answer 1

Part 1: Percentage of nitrogen $\left({\mathrm{N}}_2\right)$, oxygen $\left({\mathrm{O}}_2\right)$ , and Carbon dioxide $\left({\mathrm{CO}}_2\right)$ in air:

Components of air	Percentage by volume
Nitrogen	78%
Oxygen	21%
Carbon dioxide	0.03%

Part 2: Calculating the volume of nitrogen, oxygen, and carbon dioxide in 750 L of air:

• The percentage of Nitrogen in the air is 78%.
• It means that 100 L of air contains - 78 L of Nitrogen
• So 750 L of air contains Nitrogen $=\frac{78}{100}\times 750=585\mathrm{L}$

Part 3: Calculating the volume of oxygen in 750 L of air:

• The percentage of Oxygen in the air is 21%.
• It means that 100 L of air contains - 21 L of Oxygen
• So 750 L of air contains Oxygen $=\frac{21}{100}\times 750=157.5\mathrm{L}$

Part 4: Calculating the volume of carbon dioxide in 750 L of air:

• The percentage of Carbon dioxide in the air is 0.03%.
• It means that 100 L of air contains - 0.03 L of Carbon dioxide
• So 750 L of air contains Carbon dioxide $=\frac{0.03}{100}\times 750=0.225\mathrm{L}$

Hence, the volume of Nitrogen, Oxygen, and Carbon dioxide in 750 L of air is 585 L, 157.5 L, and 0.225 L respectively.