Question 5: Given the reaction data below, plot the data assuming both a first order and second order reaction. If a plot of ln[A] vs. time is linear, the reaction is first order (unimolecular). If a plot of 1/[A] vs. time is linear, the reaction is second order (bimolecular). This will be very fast if you use a spreadsheet program, like Excel. a) What is the molecularity of this reaction? b) Calculate the rate constant (this will be the slope of the straight line). Time (s) 0,1,2,3,4,5,Reactant mM 6.2,3.1,2.1,1.6,1.3,1.1
Question 5: Given the reaction data below, plot the data assuming both a first order and second order reaction. If a plot of ln[A] vs. time is linear, the reaction is first order (unimolecular). If a plot of 1/[A] vs. time is linear, the reaction is second order (bimolecular). This will be very fast if you use a spreadsheet program, like Excel. a) What is the molecularity of this reaction? b) Calculate the rate constant (this will be the slope of the straight line). Time (s) 0,1,2,3,4,5,Reactant mM 6.2,3.1,2.1,1.6,1.3,1.1
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Related questions
Relating plots to the order of a reaction
Consider the following reaction:
Aâproducts
The plot of [A] versus t is linear for the zero-order reaction, the plot of ln[A]versus t is linear for the first-order reaction, and the plot of 1[A] versus t is linear for the second-order reaction. [A]represents the concentration of the reactant A.
| Reaction order | Linear plot |
| zero | [A] vs. t |
| first | ln[A] vs. t |
| second | 1[A] vs. t |
The linearity of each graph can be used to identify the order of a reaction.
Characteristics of second-order reactions
For a second-order reaction, [A]âproducts, the rate of the reaction is given as rate= k[A]2, where k is the rate constant and [A] is the concentration of reactant A. The integrated rate law for second-order reactions is 1[A]t=kt+1[A]0, where [A]t is the concentration of reactant Aat time t, k is the rate constant, and [A]0 is the initial concentration of reactant A. This equation is of the type y=mx+b. Therefore, the plot of 1[A]tversus time is always a straight line with a slope k and a y intercept 1[A]0.
Consider the second-order reaction: 2HI(g)âH2(g)+I2(g) Use the simulation to find the initial concentration [HI]0 and the rate constant k for the reaction. What will be the concentration of HI after t = 7.05Ã1010 s ([HI]t) for a reaction starting under the condition in the simulation?