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26 November, 13:00

The activation energy for the reaction NO2 (g) + CO (g) ⟶NO (g) + CO2 (g) is Ea = 75 kJ/mol and the change in enthalpy for the reaction is ΔH = - 175 kJ/mol. What is the activation energy for the reverse reaction?

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  1. 26 November, 16:18
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    = 100kJ

    Explanation:

    The reverse reaction's activation energy of a reaction is the activation energy of the forward reaction plus ΔH of the reaction:

    Ea of forward reaction = 75kJ

    ∆H = - 175 kJ/mol

    Ea of reverse reaction = 75 + (-175)

    = 100kJ

    Note that a reverse reaction is one which can proceed in both direction depending on the conditions.
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