Question

7. Define Avogadro law. How can we determine atomicity of nitrogen gas molecules by using this law?

Answer 1

Avogadro law says that "if the same volume of any gas is taken at the same temperature and pressure, then the number of molecules of that gas of the same fixed volume will be the same for all."

Explanation:

• According to Avogadro's law, "all gases at the same pressure and same temperature have the same number of molecules in the same volume."
• The same volume of hydrogen and nitrogen will have the same number of molecules if they are kept at the same temperature and pressure and behave like an ideal gas.
• Using Avagadro's law, three hydrogen volumes would contain three times the molecules present in 1 nitrogen volume. Thus, the atomicity of nitrogen is 2.

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