Leader: Emily, Tyler, and Laura
Course: Chem 167
Instructor: Bonaccorsi/Meyer
Supplemental Instruction
Date: Dec 13
Iowa State University
1. For the combustion of octane, if octane is consumed at a rate of 1.67 M/s, what is the rate
of production of carbon dioxide?
Chem 167 SI:
Final Review After Exam 3
2𝐶8 𝐻18 + 25𝑂2 → 18𝐻2 𝑂 + 16𝐶𝑂2
2. The following rate law is given for the reaction 𝐴 + 𝐵 → 𝐶:
𝑟𝑐 = 𝑘[𝐴]2 [𝐵]
What is the overall order of the reaction, and the order of each reactant?
3. Use the following data to determine a rate law for the reaction 𝐴 + 2𝐵 → 𝐴𝐵2.
[A] (M)
0.6
1.8
1.8
0.6
[B] (M) r(AB2) (M/s)
0.8
1.4
0.8
12.6
3.2
12.6
4.5
1.4
4. Determine the half-life of the reactant A in the reaction 𝐴 → 𝐵 given that the initial
concentration of A is 3 M and the rate constant k is 1.24 (units vary with reaction order,
time is in seconds):
a. Assuming the reaction is zero order in A
b. Assuming the reaction is first order in A
c. Assuming the reaction is second order in A
5. Determine the rate law and the overall reaction given the following mechanism.
2𝑁𝑂2 → 𝑁𝑂3 + 𝑁𝑂
𝐶𝑂 + 𝑁𝑂3 → 𝐶𝑂2 + 𝑁𝑂2
(Rate determining step)
6. Write the expression for the reaction quotient for the reaction:
𝑁𝑎2 𝑆𝑂4 (𝑎𝑞) ↔ 2𝑁𝑎+ (𝑎𝑞) + 𝑆𝑂42− (𝑎𝑞)
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7. Using the reaction from problem 6 and assuming it is at equilibrium, how would the
reaction adjust itself to retain its equilibrium if:
a. NaCl was added to the solution
b. Na2SO4 was added to the solution
c. SO42- was removed from the solution
8. Using the reaction from problem 6, what is the equilibrium constant if the system is at
equilibrium with [Na+]= 1.6 M, [SO42-] = 0.8 M, and [Na2SO4] = .04 M at 298K?
9. Using the equilibrium constant from problem 8, determine the new equilibrium
constant for:
a. The reverse reaction.
b. The amount of each species in the solution was doubled.
c. The amount of each species in the solution was reduced to one third the
original amount.
10. What is the pH of a 0.015M solution of H2SO4?
11. Consider the following reaction:
𝐶𝐻3 𝐶𝑂𝑂𝐻(𝑎𝑞) + 𝐻2 𝑂(𝑙) ↔ 𝐶𝐻3 𝐶𝑂𝑂− (𝑎𝑞) + 𝐻3 𝑂+ (𝑎𝑞)
What is the:
a.
b.
c.
d.
Acid
Base
Conjugate acid
Conjugate base