Question

For the reaction A+B+C→D+E, the initial reaction rate was measured for various initial concentrations of reactants....

For the reaction A+B+C→D+E, the initial reaction rate was measured for various initial concentrations of reactants. The following data were collected:

Given the data calculated in Parts A, B, C, and D, determine the initial rate for a reaction that starts with 0.45 M of reagent A and 0.90 M of reagents B and C?

Trial [A]
(M)
[B]
(M)
[C]
(M)
Initial rate
(M/s)
1 0.50 0.50 0.50 1.5×10−4
2 0.50 0.50 1.50 4.5×10−4
3 1.00 0.50 0.50 6.0×10−4
4 1.00 1.00 0.50 6.0×10−4

Homework Answers

Answer #1

rate= k [A]x [B]y [C]z

from data table

1.5 x 10^-4 =k [0.5]x [0.5]y [0.5]z ------------->(1)

4.5 x 10^-4 =k [0.5 ]x [1.50]y [1.50]z ------------->(2)

6.0 x 10^-4 =k [1.00]x [0.5]y [0.5]z ------------->(3)

6 x 10^-4 =k [1]x [1]y [0.5]z ------------->(4)

by solving 1 and 2

z = 1

by solving 1 and 3

x = 2

by solving 1 and 4

y = 0

rate= k [A]2 [B]0 [C]1

from (1)

1.5 x 10^-4 =k [0.5]2 [0.5]0 [0.5]1------------>(1)

k = 1.2 x 10^-3 M-2 s-1

0.45 M of reagent A and 0.90 M of reagents B and C?

initial rate = 1.2 x 10^-3 x ( 0.45 )^2 x 0.90

initial rate = 2.19 x 10^- 4 M /s

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