Q2 of 24 Page 165

Molecular mass of Nitrogen is 28. Its atomic mass is 14. Find the atomicity of Nitrogen.

Atomicity is the number of atoms in the molecule of an element. Molecular mass is calculated by adding up the masses of respective atoms present in the molecule. Nitrogen molecule contains only nitrogen atoms. Given -


Mass of molecule of nitrogen = 28


Mass of atom of nitrogen = 14


Let number of atoms in the molecule = x


So,




Hence, the atomicity of nitrogen is 2. 2 atoms of nitrogen make one


molecule of nitrogen.


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