Question

(e) 0.8 mole of N2gas (mass from mole of molecule)​

Answer 1

1 mole of $N_2$=28 g

0.8 mole of $N_2$= 28×0.8 =22.4 g

number of molecules in 0.8 mol of $N_2=0.8×N_A\\\\=4.82×10^{23}$