compare the number of atoms in 10 gram of chlorine with that of 10 gram of Nitrogen
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The molar mass of N₂ is 28 g/mol; that of O₂ is 32 g/mol. Therefore 10 g of N₂ is about 0.36 mol, and 10 g of O₂ is 0.31 mol.
A larger fraction of a mole = a larger number of molecules, since all moles contain the same number of molecules.
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