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

Question

Rosa Sheppard

Chemistry

14 October, 16:54

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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Answers (1)

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Aliza Nolan · Answer 1

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.