The reactant concentration in a zero-order reaction was 8.00×102 M after 165 s a

Question

The reactant concentration in a zero-order reaction was 8.00×102 M after 165 s and 2.00×102 M after 320 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash. k0th = 3.87×104 Ms

Part B What was the initial reactant concentration for the reaction described in Part A? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Part C The reactant concentration in a first-order reaction was 5.70×102 M after 50.0 s and 3.10×103 M after 100 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Part D The reactant concentration in a second-order reaction was 0.770 M after 300 s and 1.40×102 M after 830 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Explanation / Answer

a) For zero order, rate = k (non integrated equuation)
Here we will use the integrated rate equation which is
[A] = [A]º - k t
0.08 M = [A]º - k (165 sec) -----1
0.02 M = [A]º - k (320 sec) -----2
Solving equations 1 & 2 for k, we get
k = 0.000387 M/sec
  

b) [A] = [A]º - k t
0.08M = [Aº] - (0.000387 M/sec x 165 sec)
0.8M = [Aº] - 0.063855 M
[A]º = 0.736 M

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