Since 1 mol of nitrogen contains 6.02 × 10²³ molecules.

So according to given information, 6.022 × 10²³ molecules of N₂ weigh = 28 gm

So, 1 molecule of N₂ will weigh = 28 / 6.022 × 10²³ grams of N₂

= 4.648 × 10^-23 grams of N₂