An agricultural research team is testing crop growth inside a sealed biosphere chamber. The table below shows the percentages of different gases in the biosphere chamber's atmosphere compared to a standard sample of clean dry air.
| Gas | Percentage in biosphere chamber (%) | Percentage in clean dry air (%) |
|---|---|---|
| Nitrogen | 75.15 | 78.08 |
| Oxygen | 18.40 | 20.95 |
| Carbon dioxide | 4.25 | 0.04 |
| Water vapour and argon | WWW | 0.93 |
Calculate the percentage W W\,W of water vapour and argon in the biosphere chamber's atmosphere.
7 exam-style questions on AQA GCSE Chemistry 9.1 The composition and evolution of the Earth's atmosphere, covering 9.1.1 The proportions of different gases in the atmosphere, 9.1.2 The Earth's early atmosphere, 9.1.3 How oxygen increased, and 9.1.4 How carbon dioxide decreased. Each one has a worked solution and a mark scheme showing where the marks go.