At the Mauna Loa Observatory, scientists analyze a dry air sample to determine the precise proportions of its constituent gases. The table below shows the measured percentages of some major gases in the sample:
| Gas | Percentage (%) |
|---|---|
| Nitrogen | 78.0978.0978.09 |
| Oxygen | 20.9520.9520.95 |
| Carbon dioxide | 0.040.040.04 |
| Argon and other trace noble gases | AAA |
Within the category 'Argon and other trace noble gases' represented by AAA, the ratio of the volume of Argon to the volume of all other trace noble gases is 91:191:191:1.
Calculate the percentage of Argon in this dry air sample.
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.