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[B] y - Exp 1 and 2 B doubles and A remains constant

You must determine determine the rate law for the following reaction from the experimental results given A + 3 B  AB 3. Experimental Results [A] M [B] M Rate [B]/s

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[B] y - Exp 1 and 2 B doubles and A remains constant

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  1. You must determine determine the rate law for the following reaction from the experimental results given A + 3 B  AB3 Experimental Results [A] M [B] M Rate [B]/s Exp. 1 0.010 0.200 3.10 x 10 -5 Exp. 2 0.010 0.400 2.50 x 10 -4 Exp. 3 0.020 0.600 1.67 x 10 -3 [B] y - Exp 1 and 2 B doubles and A remains constant The rate increases approximately 8 fold therefore exponent y must be 3

  2. Experimental Results [A] M [B] M Rate [B]/s Exp. 1 0.010 0.200 3.10 x 10 -5 Exp. 2 0.010 0.400 2.50 x 10 -4 Exp. 3 0.020 0.600 1.67 x 10 -3 [A] x Requires calculation since no two experiments have the same concentration for B. Solve for exponent x as an unknown using an equation formed by the ratio of the two experiments and including the previously determined exponent. Exp 30.00167 = k [0.020] x [0.600]3 Exp 2 0.00025 = k [0.010] x [0.400]36.68 = 2 x (3.375) 1.979 = 2 x x  1

  3. A + 3 B  AB3 Experimental Results [A] M [B] M Rate [B]/s Exp. 1 0.010 0.200 3.10 x 10 -5 Exp. 2 0.010 0.400 7.98 x 10 -4 Exp. 3 0.020 0.600 1.67 x 10 -3 rate = k [A] [B]3 Solve for k using one of the exp results Exp 1 3.10 x 10 -5 = k [0.010] [0.200]3 k = 0.3875 = 0.39 M-3 s-1

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