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Question
Differentiate between N2 and 2N.
Solution
N2 means 1 molecule of nitrogen and 2N means two atoms of nitrogen.
N2 can exist independently but 2N cannot exist independently.
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The gases chlorine, nitrogen, ammonia and sulphur dioxide are collected under the same conditions of temperature and pressure. The following table gives the volumes of gases collected and the number of molecules (x) in 20 litres of nitrogen. You are to complete the table giving the number of molecules in the other gases in terms of x.
| Gas | Volume (in litres) | Number of molecules |
| Chlorine | 10 | x |
| Nitrogen | 20 | |
| Ammonia | 20 | |
| Sulphur dioxide | 5 |
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You have collected
- 2 litres of CO2
- 3 litres of chlorine
- 5 litres of hydrogen
- 4 litres of nitrogen and
- 1 litre of SO2
under similar conditions of temperature and pressure. Which gas sample will have the least number of molecules? Justify your answers.
