A feed containing 10 mol% propylene, 15 mol% ammonia, and rest air (80 mol% N2, 20 mol% O2) is charged into a reactor to produce acrylonitrile: 2 C3H6 + 2 NH3 + 3 O2 → 2 C3H3N + 6 H2O. If the conversion of the limiting reactant is 30%, the composition of C3H3N (in mol%) in the product stream is ___________ (rounded off to two decimal places).

Question

Accepted Answer

The correct answer is 2.9 to 3. GATE 2026 official key: 2.90 to 3.00. Basis 100 mol feed: C3H6=10 (limiting, tied with O2). Reacted: C3H6=3, NH3=3, O2=4.5; formed: C3H3N=3, H2O=9. New total = 100−10.5+12 = 101.5 mol. Mol% C3H3N = 3/101.5 ≈ 2.96%.