1. Consider the reaction described by the equation Cr(H2O)63+ (aq) + SCN- (aq) → Cr(H2O)5SCN2+ (aq) + H2O(1)
For which the following initial-rate data were obtained at 25°C:
|
[Cr(H2O)63]0 (M)
|
[SCN-]0 (M)
|
Initial rate (M/s)
|
|
1.0x10-4
|
0.10
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2.0x10-11
|
|
1.0x10-3
|
0.10
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2.0x10-10
|
|
1.5x10-3
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0.20
|
6.0x10-10
|
|
1.5x10-3
|
0.40
|
1.2x10-9
|
(a) Determine the rate law and the value of the rate constant for the reaction.
(b) If the rate constant at 50°C is found to be 2x10-5 M-1 s-1, what is the activation energy of this reaction?
(c) If a catalyst were used, what do you expect to happen with the activation energy?