An Introduction to Chemical Kinetics 1st. Edition by Margaret Robson Wright | 9780470090596 | 0470090596 | Holooly

Intro to Chemical Engineering

An Introduction to Chemical Kinetics

151 SOLVED PROBLEMS

Question: 3.WP.21

The isomerization of cis- and trans- 1-ethyl-2-methyl cyclopropane comes to equilibrium.cis ↔ trans At 425.6 °C [trans]eq/[cis]eq = 2.79 Throughout reaction the following data were obtained ...

Verified Answer:

This reaction is one where both the forward and ba...

Question: 3.WP.18

The following is a highly simplified mechanism for the decomposition of C3H8: C3H8 → CH3^. +C2H5^. CH3^. + C3H8 → CH4 + C3H7^.C3H7^. → C2H4 + CH3^. CH^. + CH3^. → C2H6 Pick out the intermediates and formulate a steady state expression, +d[intermediate]/ dt ≈ 0, where possible. From these, find ...

Verified Answer:

Intermediates are

\mathrm{CH}_{3}^{•},\,\ma...

Question: 4.FP.1

Find the change in the number of degrees of freedom of each type on forming the activated complex for the following reactions: • atom + non-linear molecule to non-linear AC • linear molecule + non-linear molecule to non-linear AC • two linear molecules to linear AC • two linear molecules to ...

Verified Answer:

Atom has three translations Non-linear molecule h...

Question: 6.FP.3

Using the steady state treatment deduce the rate expressions for the following mechanisms:(a) C2H4I2 → C2H4I^• + I^• I^• + C2H4I2→ I2 + C2H4I^• C2H4I^• → C2H4 + I^• I^• + I^• + M → I2 + M (b) C4H9I → C4H9^• + I^• C4H9^• + C4H9I → C4H10 + C4H8I^• C4H8I^• → C4H8 + I^• I^• + ...

Verified Answer:

(a) Chain carriers are

{I}^{•},\;{C}_{2}{H}...

Question: 7.FP.4

At an ionic strength of 0.100 mol dm^-3 and a temperature of 25 °C, the observed rate constant for the reaction CH2BrCOO^-(aq) + S2O^2- 3(aq) → CH2S2O3COO^2-(aq) + Br^-(aq) is 1.07 × 10^-2 mol^-1 dm³ s^-1, while that for a reaction of the type PtdienX^+(aq) + Y^-(aq) → PtdienY^+(aq) + X^-(aq) ...

Verified Answer:

\mathrm{At}\,I=0.100\,\mathrm{mol}^{-1}\,\m...

Question: 7.FP.5

Aqueous Ni^2+ forms a 1:1 complex with the anion of murexide, mu^-, Ni^2+(aq) + mu^-(aq) ⇔ Ni mu^+(aq) At 25 °C observed values of the rate constant k1 and the equilibrium constant K1 depend on pressure as follows: ...

Verified Answer:

k={\frac{\kappa\,k\,T}{h}}K^{\neq\ast}[/lat...

Question: 7.FP.6

In a family of reactions A + B → C in which cycloaddition occurs, some values of ΔV^≠* and ΔV^θ are as follows: Bu is CH3CH2CH2CH2. Comment on these values, and give the values of ΔV^≠* for the reverse reactions. Predict the trend in ΔS^≠* ...

Verified Answer:

For reactions 1–3,

\Delta\,V^{\neq{*}}[/lat...

Question: 6.FP.4

The pyrolysis of propanone is a chain reaction with possible mechanism CH3COCH3 → CH3CO^• + CH3^• CH3CO^• → CH3^• + CO CH3^• + CH3COCH3 → CH4 + ^•CH2COCH3 ^•CH2COCH3 → CH3^• + CH2CO CH3^• + ^•CH2COCH3 → CH3CH2COCH3 Using this mechanism explain what is meant by the terms initiation, propagation ...

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The essential first step here is to recognize the ...

Question: 6.FP.5

The following is a possible mechanism for the decomposition of propane:C3H8 → CH3^• + C2H5^• CH3^• + C3H8→ CH4 + C3H7^• C2H5^• + C3H8 → C2H6 + C3H7^• C3H7^• → C2H4 + CH3^• C3H7^• + C3H7^• → C3H8 + C3H6 C3H7^• + C3H7^• → C6H14 Deduce the rate expression for this reaction, and obtain ...

Verified Answer:

With this mechanism the main difficulty lies in fi...

Question: 6.FP.6

The following is a schematic mechanism for the bromination of an organic compound RH:Br2 + M → 2Br^•+ M Br^• + RH → R^• + HBr R^• + Br2 → RBr + Br^• 2 Br^• + M → Br2 + M Derive the steady state rate for the production of HBr for this mechanism. If the inhibition step ...

Verified Answer:

Reaction without inhibition:

+\frac{\mathrm...

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