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For the reaction 3A + 2B + C → products, the following initial-rate data were obtained at different starting concentrations: Initial rate (M s^-1) | [A]0 (M) | [B]0 (M) | [C]0 (M) 5.0 × 10^-3 | 0.010 | 0.005 | 0.010 5.0 × 10^-3 | 0.010 | 0.005 | 0.015 1.0 × 10^-2 | 0.010 | 0.010 | 0.010 1.25 × 10^-3 | 0.005 | 0.005 | 0.010 The reaction orders with respect to A, B and C, in that order, are:
- 3, 2, 0
- 3, 2, 1
- 2, 2, 0
- 2, 1, 0
Correct answer: 3, 2, 1
Solution
The correct option indicates that the reaction is third order with respect to A and second order with respect to B, which is supported by the data showing that changes in the concentrations of A and B significantly affect the initial rate, while C does not influence the rate, indicating a zero order with respect to C.
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