学帮网AP chemistry的一道题目Step 1:N2H2O2 N2HO2- + H+ (fast equilibrium)Step 2:N2HO2- N2O + OH- (slow)Step 3:H+ + OH- H2O (fast)Nitramide,N2H2O2,decomposes slowly in aqueous solution.This decomposition is believed to occur a
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AP chemistry的一道题目
Step 1:N2H2O2 N2HO2- + H+ (fast equilibrium)
Step 2:N2HO2- N2O + OH- (slow)
Step 3:H+ + OH- H2O (fast)
Nitramide,N2H2O2,decomposes slowly in aqueous solution.This decomposition is believed to occur according to the reaction mechanism above.The rate law for the decomposition of nitramide that is consistent with this mechanism is given by which of the following?
(A) Rate= k[N2H2O2]
(B) Rate= k[N2H2O2][H+]
(C) Rate= k[N2H2O2]/[H+]
(D) Rate= k[N2H2O2]/[N2HO2-]
(E) Rate= k[N2H2O2][OH-]
Answer:C
请具体讲一讲为什么选C啊?
The rate law is determined in this case by the slowest reaction step:
rate = k[N2HO2-]
Equilibrium for step before the slowest step:
K = [N2HO2-][H+] / [N2H2O2]
K[N2H2O2] / [H+] = [N2HO2-]
rate = k{K[N2H2O2] / [H+]}
rate = (k1)[N2H2O2] / [H+]
虽然我还在学 GCSE chemistry 但是我觉得应该跟 ionic 或者 covalent bond 有关系吧？
再加上balance equation ？ 不会的话我劝你去问老师，希望早日找到满意的答案