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Worksheet 23 Reaction Rates and Rate Laws, Exercises of Chemistry

Chem1 B Introductory Chemistry by Dr. White exercise 23

Typology: Exercises

2020/2021

Uploaded on 04/20/2021

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Chem 1B Dr. White
1
Worksheet 23 Reaction Rates & Rate Laws
1) What are the usual units of reaction rate?
2) Concentrations of trace gases in the atmosphere are sometimes expressed in
molecules/cm3. If these units are used for the concentrations, then what are the units for the
reaction rate?
3. The compound RX3 decomposes according to the equation
3RX3 R + R2X3 + 3X2
In an experiment the following data were collected for the decomposition at 100°C. What is
the average rate of reaction over the entire experiment?
t(s) [RX3](mol L-1)
0 0.85
2 0.67
6 0.41
8 0.33
12 0.20
14 0.16
4. Consider the following reaction
8A(g) + 5B(g) 8C(g) + 6D(g)
If [C] is increasing at the rate of 4.0 mol L-1s-1, at what rate is [B] changing?
5. For the reaction
3A(g) + 2B(g) 2C(g) + 2D(g)
the following data was collected at constant temperature. Determine the correct rate law for
this reaction.
Trial Initial [A] Initial [B] Initial Rate
(mol/L) (mol/L) (mol/(L·min))
1 0.200 0.100 6.00 × 10-2
2 0.100 0.100 1.50 × 10-2
3 0.200 0.200 1.20 × 10-1
4 0.300 0.200 2.70 × 10-1
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Chem 1B Dr. White 1

Worksheet 23 – Reaction Rates & Rate Laws

  1. What are the usual units of reaction rate?
  2. Concentrations of trace gases in the atmosphere are sometimes expressed in molecules/cm^3. If these units are used for the concentrations, then what are the units for the reaction rate?
  1. The compound RX 3 decomposes according to the equation 3RX 3 → R + R 2 X 3 + 3X 2 In an experiment the following data were collected for the decomposition at 100°C. What is the average rate of reaction over the entire experiment? t (s) [RX 3 ](mol L-^1 ) 0 0. 2 0. 6 0. 8 0. 12 0. 14 0.
  2. Consider the following reaction 8A( g ) + 5B( g ) → 8C( g ) + 6D( g ) If [C] is increasing at the rate of 4.0 mol L
    • 1 s - 1 , at what rate is [B] changing?
  3. For the reaction 3A( g ) + 2B( g ) → 2C( g ) + 2D( g ) the following data was collected at constant temperature. Determine the correct rate law for this reaction. Trial Initial [A] Initial [B] Initial Rate (mol/L) (mol/L) (mol/(L·min)) 1 0.200 0.100 6.00 × 10
    • 2 2 0.100 0.100 1.50 × 10 -^2 3 0.200 0.200 1.20 × 10 -^1 4 0.300 0.200 2.70 × 10 -^1

Chem 1B Dr. White 2

  1. For the reaction 2A + B + 2C → D + E the following initial rate data was collected at constant temperature. Determine the correct rate law for this reaction. All units are arbitrary. Trial [A] [B] [C] Rate 1 0.225 0.150 0.350 0. 2 0.320 0.150 0.350 0. 3 0.225 0.250 0.350 0. 4 0.225 0.150 0.600 0. 7 ) Consider the reaction of peroxydisulfate ion with iodine ion: 3I - (aq) + S 2 O 8 - 2 (aq)  I 3 - (aq) + 2SO 4 - 2 (aq) At a particular temperature, the initial rate of disappearance of S 2 O 8
    • 2 varies with reactant concentration as shown in the following table: Experiment [S 2 O 8 - 2 ] (M) [I - ] (M) Initial Rate (M/s) 1 0.023 0.048 6.8x10-^6 2 0.054 0.048 1.6x
  • 5 3 0.054 0.019 6.3x
  • 6 (a) Determine the general rate law for the reaction. (b) What is the value of the rate constant for this reaction? (c) If the rate of disappearance of S 2 O 8

as a function of time, - ∆[ S 2 O 8

  • 2 ]/∆t, is 1.5x
  • 3 M/s for a particular time interval, what is the value of the rate of disappearance of I- as a function of time, - ∆[ I-]/∆t, for the same time interval? (d) What is the rate of formation of SO 4
  • 2 during the time interval in (c), that is, what is ∆[ SO 4
  • 2 ]/∆t? (e) What is the rate of disappearance of I

when [S 2 O 8

  • 2 ] = 0.075 M and [I

] = 0.060 M? (HINT: Use the general rate law here)