For an endothermic reaction A → B , an activation energy of forward reaction is 15 kcal mol-1 and enthalpy change of reaction is 5 kcal mol-1. The activation energy for reverse reaction B → A is
Correct answer: A. 10 kcal mol-1
- A. 10 kcal mol-1
- B. 15 kcal mol-1
- C. 20 kcal mol-1
- D. Zero
Explanation
The activation energy for the reverse reaction B → A is 10 kcal mol^-1. The activation energy for the reverse reaction can be calculated using the following equation: Ea,rev = Ea,fwd - ΔHrxn where: Ea,rev is the activation energy for the reverse reaction Ea,fwd is the activation energy for the forward reaction ΔHrxn is the enthalpy change of reaction Plugging in the values from the question, we get: Ea,rev = 15 kcal mol-1 - 5 kcal mol-1 = 10 kcal mol-1
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About Reaction Kinetics
Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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