The following experimental data were collected for the reaction Cl(g) + 2NO(g) → 2NOCl(g):
Trial | [Cl] (mol L⁻¹) | [NO] (mol L⁻¹) | Initial rate (mol L⁻¹ s⁻¹)
1 | 0.010 | 0.010 | 1.20 × 10⁻⁴
2 | 0.010 | 0.030 | 10.8 × 10⁻⁴
3 | 0.020 | 0.030 | 21.6 × 10⁻⁴
Construct the rate equation for the reaction.
Trial | [Cl] (mol L⁻¹) | [NO] (mol L⁻¹) | Initial rate (mol L⁻¹ s⁻¹)
1 | 0.010 | 0.010 | 1.20 × 10⁻⁴
2 | 0.010 | 0.030 | 10.8 × 10⁻⁴
3 | 0.020 | 0.030 | 21.6 × 10⁻⁴
Construct the rate equation for the reaction.
Answer: Rate = k[Cl₂][NO]²
Solution
Trials 1 → 2: [NO] tripled at constant [Cl]; rate rises — order 2 in NO.
Trials 2 → 3: [Cl] doubled at constant [NO]; rate rises — order 1 in Cl.
Trials 2 → 3: [Cl] doubled at constant [NO]; rate rises — order 1 in Cl.
CBSE Class 12 Board · 2001 · All India · Subjective