A chemist studies the kinetics of the gas-phase reaction of phosphine with diborane at 0 °C. Determine the rate law and the rate constant (use torr as the concentration unit) from the data.

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PH3(g) + BH.(g) PH3BH3(g) + BH3(g) Experiment 1 7234 Initial Concentration (torr) [BH6] 1.2 1.2 1.2 3.0 [PH3] 1.2 3.0 4.0 4.0 Initial Rate of Reaction (-A[PH3]/At) (torr/s) 1.9 X 10-3 4.7 x 10-3 6.4 x 10-3 1.6 x 10-2