1 mole of N₂ has
N2 is a diatomic gas. Hence, the smallest unit of N2 gas is a N2 molecule.
∴ 1 mole of N2 gas = 6.022 × 1023 molecules of N2
Since each molecule of N2 has 2 atoms, 1 mole of N2 gas = 2 × 6.022 × 1023 atoms
= 12.044 × 1023 nitrogen atoms