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29 April, 13:38

The rate constant for the decomposition of n2o5 is 7.78 * 10-7 at 273 k and 3.46 * 10-5 at t2. if the activation energy is 1027 kj/mol, what is the final temperature

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  1. 29 April, 13:45
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    Answer is: the temperature of the reaction is 275,48 K.

    k₁ = 7,78·10⁻ ⁷ 1/s.

    T₁ = 273 K.

    Ea = 1027 kJ/mol = 1027000 J/mol.

    k₂ = 3,46·10⁻ ⁵ 1/s.

    R = 8,314 J/K·mol.

    T₂ = ?

    Natural logarithm of Arrhenius' equation:

    lnk₁ = lnA - Ea/RT₁.

    lnk₂ = lnA - Ea/RT₂.

    ln (k₂/k₁) = (Ea/R) · (1/T₁ - 1/T₂).

    ln (3,46·10⁻⁵ 1/s / 7,78·10⁻⁷ 1/s.) = (1027000 J/mol : 8,314 J/K·mol) · · (1/273K - 1/T₂).

    3,79 = 123526,58 K · (0,00366 1/K - 1/T ₂).

    3,79 = 452,47 - 123526,58 · (1/T ₂).

    1/T₂ = 0,00363.

    T₂ = 275,48 K.
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