1) The reactant concentration in a zero-order reaction was 0.100 M after 125 s a
ID: 1085734 • Letter: 1
Question
1) The reactant concentration in a zero-order reaction was 0.100 M after 125 s and 4.00×102 M after 390 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. THE ANSWER WAS k0th = 2.26×104 Ms
What was the initial reactant concentration for the reaction described in Part A?
2)The reactant concentration in a first-order reaction was 5.30×102 M after 45.0 s and 2.10×103 M after 65.0 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.
3) The reactant concentration in a second-order reaction was 0.490 M after 200 s and 6.80×102 M after 710 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
1. Kt = [ [A]0 - [A]t ]
K(390-125) = (0.1-0.04)
K = 0.06/265 = 0.000226M/sec = 2.26*10^-4M/sec
Kt = [ [A]0 - [A]t ]
0.000226 *125 = [A]0 - 0.04
0.02825 = [A]0 - 0.04
[A]0 = 0.02825+0.04 = 0.06825M
2. K = 2.303/t log[A0]/[A]
= 2.303/(65-45) log0.053/0.0021
= 2.303*1.4020/20 = 0.16sec^-1
3. Kt = [ 1/[A] - 1/[A0]
K(710-200) = [ 1/0.068 -1/0.49]
K*510 = 14.7-2.0408
K = 12.6592/510 = 0.0248M^-1sec^-1
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