Air is an important inexhaustible natural resource. It is essential for the survival of human beings, microbes, plants and animals. The following table shows the percentage of various gases in air.
| Contents of air |
Percentage ( by volume) |
| Nitrogen |
78 |
| Oxygen |
21 |
| Other (carbon dioxide, inert gases, water vapours, etc.) |
1 |
(i) In 800 m3 of air, calculate the approximate quantities of nitrogen, oxygen and other gases.
(ii) If a certain quantity (by volume) of air contains 4,200 litres of oxygen, find the total quantity of air taken and the amount of nitrogen in it.
