We know that 1 mole of any substance at NTP contains Avogadro’s number of molecules.
0.35 Mole of nitrogen contains = 0.35× 6.022 × 10 23 molecules of N2
=2.17 × 10 23 molecules of N2 Hence there are 2.17 × 10 23molecules of N2 are present in 0.35 mol of N2 .