Gas Phase Kinetics 💡 Find Wrong Option Fast
❓ Question Reaction: A ( g ) → 2 B ( g ) + C ( g ) A(g) \rightarrow 2B(g) + C(g) First order reaction Given: t (min) Pressure (mm Hg) 10 160 ∞ 240 Find the incorrect statement . 🖼 Question Image ✍️ Short Solution In gas reactions: P ∝ n P \propto n So pressure can be used as a substitute for concentration. 🔷 Step 1 — Initial Pressure Idea 💯 At t = 0 t = 0 : Only A present → let pressure = P 0 P_0 Reaction: A → 3 moles (2B + C) A \rightarrow 3 \text{ moles (2B + C)} So pressure increases during reaction. 🔷 Step 2 — Use Final Pressure At t = ∞ t = \infty : All A converted Final pressure: P ∞ = 3 P 0 P_\infty = 3P_0 Given: 240 = 3 P 0 240 = 3P_0 P 0 = 80 P_0 = 80 🔷 Step 3 — Pressure of A at Time t At time t: P t = 160 P_t = 160 Let pressure of A remaining = P A P_A Total pressure: P t = P A + products P_t = P_A + \text{products} Using relation: P A = 3 P 0 − 2 P t P_A = 3P_0 - 2P_t P A = 240 − 2 ( 160 ) P_A = 240 - 2(160) ...