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Chemical Kinetics — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryChemical Kinetics3 Marks
Question
Answer the following questions on the basis of the given plot of potential energy vs reaction coordinate:
  1. What is the threshold energy for the reaction?
  2. What is the activation energy for forward reaction?
  3. What is the activation energy for backward reaction?
  4. What is enthalpy change for the forward reaction?
✓

Answer

i. Threshold energy for the reaction $=300 \mathrm{KJ} \mathrm{~mol}^{-1}$.
ii. Activation energy for the forward reaction $=300-150=150 \mathrm{KJ} \mathrm{~mol}^{-1}$.
iii. Activation energy for the backward reaction $=300-100=200 \mathrm{KJ} \mathrm{~mol}^{-1}$.
iv. Enthalpy change for the forward reaction $\Delta_t \mathrm{H}=100-150=-50 \mathrm{KJ} \mathrm{~mol}^{-1}$.

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