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Enthalpy Profile
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🧪 Chemistry
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Parameters
Activation Energy Ea (kJ/mol)
Enthalpy Change ΔH (kJ/mol)
Key Concepts
•
Ea(forward)
: energy barrier reactants must overcome to reach the transition state
•
Ea(reverse)
= Ea(forward) − ΔH (Hess's law applied to activation energies)
• A catalyst lowers Ea without changing ΔH or equilibrium position
• Exothermic (ΔH < 0): products are at lower enthalpy than reactants
• Endothermic (ΔH > 0): products are at higher enthalpy; Ea(rev) < Ea(fwd)
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