Ch.14 - Chemical Kinetics
Chapter 14, Problem 91
The values of Ea = 248 kJ>mol and ΔE = 41 kJ>mol have been measured for the reaction H21g2 + CO21g2S H2O1g2 + CO1g2 (b) Considering the geometry of the reactants and products, suggest a plausible structure for the transition state.
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Related Practice
Textbook Question
Two reactions have the same activation energy, but their
rates at the same temperature differ by a factor of 10.
Explain.
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Textbook Question
When the temperature of a gas is raised by 10 °C, the collision
frequency increases by only about 2%, but the reaction
rate increases by 100% (a factor of 2) or more. Explain.
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Textbook Question
What fraction of the molecules in a gas at 300 K collide with an
energy equal to or greater than Ea when Ea equals 50 kJ/mol?
What is the value of this fraction when Ea is 100 kJ/mol?
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Textbook Question
Consider three reactions with different values of Ea and ΔE:
Reaction 1. Ea = 20 kJ>mol; ΔE = -60 kJ/mol
Reaction 2. Ea = 10 kJ>mol; ΔE = -20 kJ/mol
Reaction 3. Ea = 40 kJ>mol; ΔE = +15 kJ/mol
(b) Assuming that all three reactions are carried out at the same temperature and that all three have the same frequency factor A, which reaction is the fastest and which is the slowest?
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Textbook Question
Consider three reactions with different values of Ea and ΔE:
Reaction 1. Ea = 20 kJ>mol; ΔE = -60 kJ/mol
Reaction 2. Ea = 10 kJ>mol; ΔE = -20 kJ/mol
Reaction 3. Ea = 40 kJ>mol; ΔE = +15 kJ/mol
(c) Which reaction is the most endothermic, and which is the most exothermic?
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Textbook Question
A certain first-order reaction has a rate constant of
1.0 * 10-3 s-1 at 25 °C.
(b) What is the Ea (in kJ/mol) if the same temperature
change causes the rate to triple?
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