Find the mass in grams of 1.40x10^23 molecules of n2

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

1.40x10^23 molecules of N2 (1 mol / 6.022 x 10^23 molecules) (28.02 g / mol) = 6.51 g N2