The reaction A + B → products was studied at 298 K. Initial-rate data are shown below.
Experiment [A] (M) [B] (M) Initial rate (M·s⁻¹)
1 0.100 0.100 1.2 × 10⁻³
2 0.200 0.100 2.4 × 10⁻³
3 0.100 0.300 1.08 × 10⁻²
Determine the numerical value and units of the rate constant k.