Problem: Based on their activation energies and energy changes and assuming that all collision factors are the same, which of the following reactions would be fastest in the reverse direction?(a) Ea = 45 kJ/mol; ΔE = –25 kJ/mol(b) Ea = 35 kJ/mol; ΔE = –10 kJ/mol(c) Ea = 55 kJ/mol; ΔE = 10 kJ/mol

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We are being asked to determine which of the following reactions would be fastest in the reverse direction.


Recall the definitions 

  • Ea is the difference in energy between reactants and transition state.
  • ΔE is the difference in energy between products and reactants
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Problem Details

Based on their activation energies and energy changes and assuming that all collision factors are the same, which of the following reactions would be fastest in the reverse direction?
(a) Ea = 45 kJ/mol; ΔE = –25 kJ/mol
(b) Ea = 35 kJ/mol; ΔE = –10 kJ/mol
(c) Ea = 55 kJ/mol; ΔE = 10 kJ/mol

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