Question

The following graph is obtained for a first-order reaction (A → P). The activation energy (E\(_a\) in kJ/mol\(^{-1}\)) and heat of reaction (ΔH in kJ/mol\(^{-1}\)) for this reaction are respectively

• A. 5, 15
• B. 15, 5
• C. 25, 5
• D. 10, 25

Hint:

To determine activation energy and heat of reaction from a potential energy diagram, remember that activation energy is the energy barrier, and heat of reaction is the difference in energy between products and reactants.

Answer 1

The Correct Option is B

From the given graph, we can identify the activation energy (E\(_a\)) as the difference between the energy at the transition state and the energy of the reactants, which is 15 kJ/mol. The heat of reaction (ΔH) is the difference between the energy of the products and reactants, which is 5 kJ/mol. Therefore, the correct answer is option (2).