The activation energy for the reaction NO2(g)+CO(g) ⟶NO(g)+CO2(g) is 125 kJ / mol , and ΔE for t

step 1 So we are given a reaction between NO2 and CO2, they produce NO and CO2. The activation energy o

The activation energy for the reaction NO2(g)+CO(g)...

The activation energy for the reaction $$ \mathrm{NO}_{2}(g)+\mathrm{CO}(g) \longrightarrow \mathrm{NO}(g)+\mathrm{CO}_{2}(g) $$ is 125 $\mathrm{kJ} / \mathrm{mol}$ , and $\Delta E$ for the reaction is $-216 \mathrm{kJ} / \mathrm{mol}$ . What is the activation energy for the reverse reaction $\left[\mathrm{NO}(g)+\mathrm{CO}_{2}(g) \longrightarrow \mathrm{NO}_{2}(g)+\mathrm{CO}(g)\right] ?$

The activation energy for the reaction
$$
\mathrm{NO}_{2}(g)+\mathrm{CO}(g) \longrightarrow \mathrm{NO}(g)+\mathrm{CO}_{2}(g)
$$
is 125 $\mathrm{kJ} / \mathrm{mol}$ , and $\Delta E$ for the reaction is $-216 \mathrm{kJ} / \mathrm{mol}$ . What is the activation energy for the reverse reaction $\left[\mathrm{NO}(g)+\mathrm{CO}_{2}(g) \longrightarrow \mathrm{NO}_{2}(g)+\mathrm{CO}(g)\right] ?$

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Key Concepts

Reaction Energy Change (?E)

The reaction energy change, often denoted as ?E or ?H for enthalpy, is the difference in energy between the reactants and the products. A negative value indicates an exothermic reaction, where energy is released, while a positive value indicates an endothermic reaction, where energy is absorbed.

Activation Energy

Activation energy is the minimum energy required to transform reactants into products by overcoming the energy barrier associated with the transition state. It defines the rate at which a chemical reaction proceeds by dictating how many molecules have sufficient energy to react.

Energy Profile Diagram

An energy profile diagram graphically represents the energy changes throughout a reaction. It shows the energy levels of reactants, the transition state (the peak representing the activation energy), and the products, which aids in understanding the energetics of both the forward and reverse reactions.

Reverse Reaction

The reverse reaction is the process in which products revert back to reactants. Its activation energy can be calculated by considering the difference between the energy of the transition state and that of the products, using the overall reaction energy change to relate the energy profiles of the forward and reverse processes.

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