Iodine monochloride, ICl, is a yellow-brown gas. It reacts with hydrogen gas under certain conditions as shown. 2ICl(g) + H2(g) → 2HCl(g) + I2(g) Experiments are performed using different starting concentrations of ICl and H2. The initial rate of each reaction is measured. The following results are obtained. experiment | [ICl]/mol dm⁻³ | [H2]/mol dm⁻³ | relative rate of reaction ---|---|---|--- 1 | 4.00 × 10⁻³ | 4.00 × 10⁻³ | 1.00 2 | 4.00 × 10⁻³ | 7.00 × 10⁻³ | 1.75 3 | 4.00 × 10⁻³ | 1.00 × 10⁻² | 2.50 4 | 5.00 × 10⁻³ | 8.00 × 10⁻³ | 2.50 5 | 7.00 × 10⁻³ | 8.00 × 10⁻³ | 3.50