The energies of activation for forward and re | vedclass

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

Question

(D) The enthalpy change of a reaction $(\Delta H_R)$ is defined as the difference between the activation energy of the forward reaction $(E_f)$ and th

Vedclass · Accepted Answer

$-20$

Vedclass · Answer

(D) The enthalpy change of a reaction $(\Delta H_R)$ is defined as the difference between the activation energy of the forward reaction $(E_f)$ and the activation energy of the reverse reaction $(E_b)$: $\Delta H_R = E_f - E_b$.
Given $E_f = 180 \ kJ \ mol^{-1}$ and $E_b = 200 \ kJ \ mol^{-1}$,$\Delta H_R = 180 - 200 = -20 \ kJ \ mol^{-1}$.
$A$ catalyst lowers the activation energy of both forward and reverse reactions by the same amount,but it does not change the enthalpy of the reaction $(\Delta H_R)$.
Therefore,the enthalpy change remains $-20 \ kJ \ mol^{-1}$.

Similar Questions

When a biochemical reaction is carried out in a laboratory without the presence of enzymes,the rate of reaction is $10^{-6}$ times slower. What will be the activation energy $(E_a)$ in the presence of enzymes?

From the given data for the reaction $H_2 + I_2 \rightarrow 2HI$,calculate the activation energy $(E_a)$:
$T_1 = 769 \ K, \ 1/T_1 = 1.3 \times 10^{-3} \ K^{-1}, \ \log_{10} K_1 = 2.9$
$T_2 = 667 \ K, \ 1/T_2 = 1.5 \times 10^{-3} \ K^{-1}, \ \log_{10} K_2 = 1.1$

What is the role of a catalyst in a catalytic reaction?

For a first order chemical reaction,

In a reaction,the rate constant $K_1$ is twice the rate constant $K_2$ of another reaction. Find the relationship between the activation energies $E_1$ and $E_2$ of the two reactions at the same temperature.

Vedclass Test Series

Exam Paper Generator

Online Exam Module