Part A The reactant concentration in a zero-order reaction was 7.00×10 2 M after
ID: 482110 • Letter: P
Question
Part A
The reactant concentration in a zero-order reaction was 7.00×102M after 185 s and 3.00×102M after 325 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 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.
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line,y=mx+b.
Order Integrated Rate Law Graph Slope 0 [A]=kt+[A]0 [A] vs. t k 1 ln[A]=kt+ln[A]0 ln[A] vs. t k 2 1[A]= kt+1[A]0 1[A] vs. t kExplanation / Answer
a. [A]=Ao-kt
(0.07) = Ao - k(185)
(0.03) = Ao - k(325)
Subtracting the two equations, we can solve for k=2.86*10^-4 M/s
b. [A]=Ao-kt
(0.07) = A - 2.86*10^-4(185)
A = 0.12291 M