The following data was collected over five different experiments. for this reaction: BF3 + NH3 → F3BNH3 Experiment [BF3] M [NH3] M 1 0.250 0.250 2 0.250 0.125 3 0.200 0.100 4 0.350 0.100 5 0.175 0.100 The initial rate of the first reaction was 0.310 mol/L min.  The second reaction was one half that rate, the third reaction was one third times the rate of the first reaction, and the fourth reaction was 0.17 times the rate of the first reaction.  The fifth reaction was half the rate of the forth reaction.  Determine the value for the constant k.

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