Which of the compounds has the largest mass fraction of nitrogen? a) (NH4) 2 SO4 b) N2O3 c) NH4NO3 d) NaNO3

Let’s calculate the mass fraction of nitrogen in each of the substances according to the formula ω = M (N): M (in-va) × 100.
a) M ((NH₄) ₂SO₄) = 14 × 2 + 4 × 2 + 32 + 64 = 28 + 8 + 32 + 64 = 132 g / mol.
ω = M (N): M ((NH₄) ₂SO₄) × 100 = 28: 132 × 100 = 21.21%.
b) M (N₂O₃) = 28 + 48 = 76.
ω = M (N): M (N₂O₃) × 100 = 28: 76 × 100 = 36.8%.
c) M (NH₄NO₃) = 14 + 4 + 14 + 48 = 80.
ω = M (N): M (NH₄NO₃) × 100 = 28: 80 × 100 = 35%.
d) M (NaNO₃) 23 + 14 + 48 = 85
ω = M (N): M (NaNO₃) × 100 = 14: 85 × 100 = 16.5%.
The largest mass fraction of nitrogen in nitrogen oxide (III) N₂O₃ under the letter b.