To help you understand how to interpret potential energy diagrams. The graphs sh

Question

To help you understand how to interpret potential energy diagrams. The graphs shown here are called potential energy diagrams. They show the potential energy of a system as it changes from reactants to products. The first graph shows the uncatalyzed reaction (Figure 1); the second graph shows the catalyzed reaction (Figure 2). What is the value of the enthalpy change of the uncatalyzed reaction? Express your answer in kilojoules. What is the value of the activation energy of the uncatalyzed reaction in reverse? Express your answer in kilojoules. What is the value of the enthalpy change of the uncatalyzed reaction in reverse?

Explanation / Answer

B)

Enthalpy change for the uncatalyzed reaction:

dH = Hfinal - Hinitial

Hfinal = products = 100 kJ

Hinitial = initial = 225 approx

dH = 100-225 = -125 kJ

C)

the activation energy f the uncatalyzed reaction:

in reverse reaction:

The Ea is calculated by:

Ea = Htop point - Hproducts

Ea = 400 - 100 = 300 kJ

Ea = 300 kJ for reverse reaction;

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