70% LD 12:49 AM iPad angel spcollege.edu Homework Help Ask A Question Che CHM204

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70% LD 12:49 AM iPad angel spcollege.edu Homework Help Ask A Question Che CHM2046 General Chemistry ll n Cl practice 1.pdf 24. The reaction 2NOBr 2NO +Br2 exhibits the rate law 2 ADNOBrd Rate icLNOBrd where k 1.0 x 10 M s 1 at 25OC. This reaction is run where the initial concentration of NOBr (LNOBrlo is 1.00 x 10 M. The [NO] after 1.00 hour has passed is A) 3.6 x 10-4 M B) 9.9 x 10-3 M C) 9.7 x 10-3 M D) 1.0 x 10 M E) none of these 25. The reaction is first order in N205. For this reaction at 450C, the rate constant k 1.0 x 10 s s 1, where the rate law is defined as AIN2Os Rate At For a particular experiment (IN205]0 31.0 x 10 MD, calculate IN2O5 after 3.5 x 105 seconds. A) 3.5 M B) 1.0 x 10-3 M C) 3.0 x 10-5 M D) 0 M E) 10 M 26. The decomposition of ozone may occur through the two-step mechanism shown: step 1 O3 O2+O step 2 O2 +O 20 The oxygen atom is considered to be a(n) A) reactant B) product C) catalyst D) reaction intermediate E) activated complex

Explanation / Answer

1) K2 = 1/t[1/At - 1/A0]

1*10^-5 = 1/3600[1/At - 1/1*10^-3]

At = 9.9*10^-4 M

so the ans is non of the above

2) K = 2.303/t log(initial/final)

1*10^-5 = 2.303/3.5*10^6 log(1*10^-3/final)

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