Question

The recombination of iodine atoms in the gas phase in the presence of argon was investigated and the order of the reaction was determined by the method of initial rates. The initial rates of reaction of 2 1 (g) + Ar(g) → 12(g) + Ar(g) were as follows: [lo/(10-5 mol dm3) 1.0 l'o/(mol dm"3 S-1) (a) 8.70 × 10-4 3.48 × 10-3 1.39 × 10-2 3.13×10-2 2.0 4.0 6.0 (b) 4.35 × 10-3 (c) 8.69 × 10-3 1.74× 10-2 3.47 × 10-2 6.96x10-2 1.38 × 10-1 1.57x10" 3.13×10-1 The Ar concentrations are (a) 1.0 mmol dm-3, (b) 5.0 mmol dm-3, and (c) 10.0 mmol dm-3. Determine the orders of reaction with respect to the I and Ar atom concentrations and the rate constant.

Answer 1

4.35

2