Rate information was obtained for the following reaction at 25°C and 33°C; Cr(H2O)6 3+ + SCN¯ ---> Cr(H2O)5NCS2+ + H2O(l) Initial Rate [Cr(H2O)6 3+] [SCN-] @ 25°C 2.0x10-11 1.0x10-4 0.10 2.0x10-10 1.0x10-3 0.10 9.0x10-10 2.0x10-3 0.15 2.4x10-9 3.0x10-3 0.20 @ 33°C 1.4x10-10 1.0x10-4 0.20 a) Write a rate law consistent with the experimental data. b) What is the value of the rate constant at 25°C? c) What is the value of the rate constant at 33°C? d) What is the activation energy for this reaction? e) Can a 4th order reaction occur?
First three sub-parts are solved
Rate information was obtained for the following reaction at 25°C and 33°C;
Cr(H2O)6 3+ + SCN¯ ---> Cr(H2O)5NCS2+ + H2O(l)
Initial Rate [Cr(H2O)6 3+] [SCN-]
@ 25°C 2.0x10-11 1.0x10-4 0.10
2.0x10-10 1.0x10-3 0.10
9.0x10-10 2.0x10-3 0.15
2.4x10-9 3.0x10-3 0.20
@ 33°C 1.4x10-10 1.0x10-4 0.20
a) Write a rate law consistent with the experimental data.
b) What is the value of the rate constant at 25°C?
c) What is the value of the rate constant at 33°C?
d) What is the activation energy for this reaction?
e) Can a 4th order reaction occur?
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