Verified answer

1) V(N2) = n(N2) × Vm = 3,65 × 22,4 = 81,76 л

2) n(N2) = V(N2) : Vm = 210 : 22,4 = 9.375 моль

3) n(N2) = V(N2) : Vm = 168 : 22,4 = 7,5 моль

m(N2) = n(N2) × M(N2) = 7,5 × 28 = 210 г