For the reaction A_2 + B_2 rightleftharpoons | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) For the reaction $A_2 + B_2 \rightleftharpoons 2 AB$,the enthalpy change $\Delta H$ is given by the difference between the activation energy of th

Vedclass · Accepted Answer

The catalyst does not alter the Gibbs energy change of the reaction.

Vedclass · Answer

(A) For the reaction $A_2 + B_2 \rightleftharpoons 2 AB$,the enthalpy change $\Delta H$ is given by the difference between the activation energy of the forward reaction $(E_f)$ and the backward reaction $(E_b)$: $\Delta H = E_f - E_b = 180 \ kJ \ mol^{-1} - 200 \ kJ \ mol^{-1} = -20 \ kJ \ mol^{-1}$. When a catalyst is added,it lowers the activation energy for both the forward and backward reactions by the same amount $(100 \ kJ \ mol^{-1})$: $E_{f(cat)} = 180 - 100 = 80 \ kJ \ mol^{-1}$ $E_{b(cat)} = 200 - 100 = 100 \ kJ \ mol^{-1}$ The new enthalpy change is $\Delta H_{cat} = 80 - 100 = -20 \ kJ \ mol^{-1}$. Since $\Delta H$ and $\Delta G$ are state functions,they depend only on the initial and final states of the reactants and products,not on the path taken. Therefore,a catalyst does not change the $\Delta H$ or $\Delta G$ of a reaction.

Similar Questions

For the reaction,$A \rightleftharpoons B$,$E_a = 50 \ kJ \ mol^{-1}$ and $\Delta H = -20 \ kJ \ mol^{-1}$. When a catalyst is added,$E_a$ decreases by $10 \ kJ \ mol^{-1}$. What is the $E_a$ for the backward reaction in the presence of the catalyst?

What does $P \cdot Z_{AB} \cdot e^{-\frac{E_a}{RT}}$ indicate in the rate equation?

Give an example of a collision in the proper direction that results in the formation of a product.

Find True $(T)$ and False $(F)$ statements among the following:
$1.$ All collisions in a reaction result in the formation of products.
$2.$ All collisions in a reaction are effective.
$3.$ The number of collisions depends on the rate of reaction.

The temperature-dependent equation for the rate constant is written as:

Vedclass Test Series

Exam Paper Generator

Online Exam Module