Question

The reaction O3 + NO → O2 + NO2 has Ea = 10.7 kJ/mole and ΔH = – 199.8 kJ/mole. What is the activation energy for the following reaction?

O2 + NO2 → O3 + NO

Answer 1

The activation energy for the reaction O2 + NO2 -> O3 + NO is 10.7 kJ/mole.

Step-by-step explanation:

The activation energy for a reaction can be determined using the Arrhenius equation, which relates the rate constant of a reaction to the activation energy (Ea). The equation is given as:

K = A e-Ea/RT

Where K is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.

In this case, the activation energy for the reaction O2 + NO2 → O3 + NO is 10.7 kJ/mole.

Answer 2

Ea = 210.5kJ/mole

Step-by-step explanation:

When the reaction:

O3 + NO → O2 + NO2

Occurs, requires 10.7kJ/mole and releases -199.8kJ/mole.

For the forward reaction:

O2 + NO2 → O3 + NO

The Ea is the sum of Ea of the forward reaction and - ΔH, that is:

Ea = Ea - (-ΔH)

Ea = 10.7kJ/mol - (-199.8kJ/mol)

Ea = 210.5kJ/mole