Calculate the mass of the following: 3 . 011 × 10 23 number of N atoms.

We know that, 1 mole = 6 . 023 × 10 23 number of atoms. 6 . 023 × 10 23 atoms = 1 mole 1 atom = 1 6 . 023 × 10 23 mole Therefore, 3 . 011 × 10 23 atoms is = 3 . 011 × 10 23 × 1 6 . 023 × 10 23 = 1 2 mole 1 mole of N is = 14 gm So, 1 2 mole = 14 × 1 2 = 7 gm The mass of 3 . 011 × 10 23 number of N atoms is = 7 gm .

Calculate the mass of the following: 6 . 023 × 10 23 number of N 2 molecules.

1 mole = 6 . 023 × 10 23 atoms The number of moles is, n = Mass of N 2 molecules Molar mass of N 2 Here, n = 1 mole Therefore, Mass of N 2 molecules = n × Molar mass of N 2 = 1 × 28 = 28 gm Hence, the mass of 6 . 023 × 10 23 number of N 2 molecules is 28 gm .

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