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Chapter 6: Problem 6.21 (page 234)

Which value (if any) corresponds to a faster reaction: (a) Ea=40kJ/molor Ea=4kJ/mol; (b) a reaction temperature of 0掳C or a reaction temperature of 25掳C; (c) Keq=10or Keq=100; (d) role="math" localid="1648275832528" 鈭�H=-10kJ/molor 鈭�H=10kJ/mol ?

Short Answer

Expert verified

Answer

  1. Ea=4kJ/mol corresponds to a faster reaction.
  2. The temperature 25掳Ccorresponds to a faster reaction.
  3. The rate of a reaction is independent of Keq.
  4. The reaction rate is independent of 鈭�H掳 .

Step by step solution

01

Step-by-Step SolutionStep 1: Activation energy

The energy barrier that needs to be exceeded for the reactant molecules to convert into products is named the activation energy.

A reaction involving lower activation energy will proceed faster.

02

Factors affecting the rate of a reaction

The factors affecting the rate of a reaction are:

  • Activation energy: A reaction involving lower activation energy will proceed faster.
  • Reactant concentration: Reactant concentration is directly related to the rate of the reaction, i.e., the higher the concentration of the reactants, the faster is the rate of the reaction.
  • Temperature: An increase in temperature leads to an increase in the rate of the reaction.
03

Predicting the reaction rate

  1. The rate of a reaction is inversely proportional to the activation energy of the reaction, and hence the reaction with lower Eacorresponds to a faster reaction.Therefore, Ea=4kJ/mol will correspond to a faster reaction.
  2. Since the rate of reaction shares a direct relation with the temperature of the reaction, the higher temperature among the given two, i.e., 25掳Cwill correspond to a faster reaction.
  3. The equilibrium constant does not affect the rate of a reaction.
  4. The rate of a chemical reaction is independent of 鈭�H掳 (change in enthalpy).

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