1. Tardigrade
  2. Question
  3. Chemistry
  4. An exothermic chemical reaction proceeds by two stages. Reactants xrightarrow textStage 1 Intermediate xrightarrow textStage 2 Products The activation energy of state I is 50 kJ mol-1. The overall enthalpy change for the reaction is -100 kJ mol-1. Which diagram could represent the energy level diagram for the reaction?

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Q. An exothermic chemical reaction proceeds by two stages.
Reactants $\xrightarrow{\text{Stage}\, 1}$ Intermediate $\xrightarrow{ \text{Stage}\, 2 }$ Products The activation energy of state $I$ is $50 \,kJ$ $mol^{-1}$. The overall enthalpy change for the reaction is $-100 \,kJ$ $mol^{-1}$. Which diagram could represent the energy level diagram for the reaction?

AMUAMU 2014Chemical Kinetics

Solution:

image
Diagram $\left(c\right)$ represents exothermic reaction with
$E_{a}$ $=200-150=50\, kJ$ $mol^{-1}$ and
$\Delta H$ $=50-150=-100\, kJ$ $mol^{-1}$