A technician measures the mass and volume of the gas in four sampling bags. All measurements are made at room temperature and pressure.
| Sampling bag | Volume of gas (dm3\mathrm{dm^{3}}dm3) | Mass of gas (g) |
|---|---|---|
| P | 0.480 | 0.0400 |
| Q | 0.600 | 0.400 |
| R | 0.300 | 0.400 |
| S | 0.240 | 0.440 |
One mole of any gas occupies 24 dm324\,\mathrm{dm^{3}}24dm3 at room temperature and pressure.
Relative atomic mass (ArA_rAr): H = 1.0 C = 12.0
Which sampling bag could contain methane, CH4\mathrm{CH_{4}}CH4?
Sampling bag Q
Sampling bag S
Sampling bag R
Sampling bag P
152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.