Multiple Choice
The activation energy of a reaction is 3.5 kJ/mol and the change in enthalpy for the forward reaction is -67.2 kJ/mol. What is the activation energy of the reverse reaction?
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15. Chemical Kinetics
Energy Diagrams
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In a potential energy diagram for a chemical reaction, how is the enthalpy change (ΔH) of the reaction represented?
A
As the difference in energy between the reactants and products
B
As the energy at the transition state
C
As the total area under the curve
D
As the height of the activation energy barrier
Verified step by step guidance1
Understand that a potential energy diagram plots the energy of the system as the reaction progresses from reactants to products.
Identify that the enthalpy change (\$\Delta H\$) corresponds to the difference in energy between the reactants and the products on the diagram.
Note that the energy at the transition state represents the activation energy, not the enthalpy change.
Recognize that the total area under the curve is not related to enthalpy change; it does not represent any thermodynamic quantity directly.
Understand that the height of the activation energy barrier is the energy difference between the reactants and the transition state, which is different from \$\Delta H\$.
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