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Question

The molecular weights of oxygen and sulphur dioxide are 32 and 64 respectively. If 1 litre of oxygen at 15oC and 740 mm pressure contains N molecules, the number of molecules in 2 litre of sulphur dioxide under the same conditions of temperature and pressure will be:

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Solution

By using Avogadro Law,
Vn at constant pressure & temperature
Thus, VO2VSO2=nO2nSO2
1L2L=N/NAnSO2
nSO2=2NNA
Thus, molecules of SO2 is 2N .

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