8. Boron phosphide is obtained by the reaction between boron tribromide and phosphorus tribromide in a hydrogen atmosphere at high temperature (>750 C). The table shows the dependence of the reaction rate r on the concentrations of the reagents:
Temperature, C [BBr3] mol*l-1 [PBr3] mol*l-1 [ PBr3] mol*l-1 [H2] mol*l-1 r mol*l-1*s-1
800 2.25*10-6 9.00*10-6 0.070 4.60*10-8
800 4.50*10-6 9.00*10-6 0.070 9.20*10-8
800 9.00*10-6 9.00*10-6 0.070 18.4*10-8
800 2.25*10-6 2.25*10-6 0.070 1.15*10-8
800 2.25*10-6 4.50*10-6 0.070 2.30*10-8
800 2.25*10-6 9.00*10-6 0.035 4.60*10-8
800 2.25*10-6 9.00*10-6 0.070 19.6*10-8
Determine the reaction order for each substance and calculate the activation energy of the reaction.

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