An endothermic reaction A to B has an activation energy 15 kcal/mole and the heat of reaction is 5 kcal/mole.The activation energy of the reaction B to A is?

Question

Answer

Activation Energy of Reaction B to A

Introduction

In this problem, we are given the activation energy and heat of reaction for a reaction from A to B and are asked to find the activation energy for the reverse reaction from B to A.

Explanation

For an endothermic reaction, the heat of reaction is positive, and energy is absorbed from the surroundings. The activation energy is the minimum amount of energy required for the reactant molecules to overcome the energy barrier and form the products.

According to the principle of microscopic reversibility, the activation energy for the reverse reaction is equal to the activation energy for the forward reaction. Therefore, the activation energy for the reaction B to A is also 15 kcal/mole.

The heat of reaction for the reverse reaction can be calculated using Hess's law, which states that the change in enthalpy for a reaction is the same regardless of the route taken from reactants to products. The heat of reaction for B to A is equal in magnitude but opposite in sign to that of A to B, which is -5 kcal/mole. Therefore, the heat of reaction for B to A is +5 kcal/mole.

Conclusion

In summary, the activation energy for the reaction B to A is 15 kcal/mole, and the heat of reaction is +5 kcal/mole.

Answer

Similar Class 12 Doubts

Consider the endothermic reaction, X→YHeat o f reaction = ΔH with Ef = activation energy of the forw ard reaction.Eb = activation energy of the backward reaction.Then

The reaction has a frequency factor A of 3.3 � 10 ^10 per second and an activation energy of 160 kJ/g mole. calculate the time required to convert 80% of NO2 at 100 degree celcius?. What can you deduce from the results obtained?

The activation energy of a reaction is 225 kcal mol^-1 and the value of rate constant at 40 degree Celsius is 1.8*10^-5.calculate the frequency factor, A.?

In a reversible reaction the energy of activation of the forward reaction is 50 kcal. The energy of activation for the reverse reaction will be [1996]

In presence of catalyst, the activation energy is lowered by 3 kcal at 270C. Hence, the rate of reaction will increaseby

Top Courses for Class 12

Suggested Free Tests

Related Content

Schools

Competitive Examinations

Quick Access Links

Technical Exams