CH-415
Collecting gases
Chemistry · Secondary 3 · Medium · Collecting gases
In an experiment, 25.0 cm³ of hydrogen gas is collected over water at room temperature. The gas is dried and its volume becomes 22.0 cm³ at the same temperature and pressure. What causes the decrease in volume?
- Hydrogen reacts with air.
- Some hydrogen dissolves in water.
- Water vapour is removed from the gas.
- The syringe leaks during drying.
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