La valeur de l'énergie d'activation de la décomposition du butène C₄H₈ en éthène C₂H₄ est de 262 kJ.mol^-1.

À 300K, la constante de vitesse est de 7.23 x 10^-10 s^-1.

Quelle est la constante de vitesse à 65.0°C?

Question

La valeur de l'énergie d'activation de la décomposition du butène C₄H₈ en éthène C₂H₄ est de 262 kJ.mol^-1.

À 300K, la constante de vitesse est de 7.23 x 10^-10 s^-1.

Quelle est la constante de vitesse à 65.0°C?

| Chimie générale 2

Accepted Answer

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

k = Ae^-Ea/RT

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

with T₁ = 300 K and T₂ = 65.0°C = 338 K

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

Arrhenius equation:

k = Ae^-Ea/RT

k₂ / k₁ = Ae^-Ea/RT2 / Ae^-Ea/RT1

⇒ k₂ / k₁ = e^{-E_a/RT₂ + E_a/RT₁}

⇒ k₂ = k₁x e^{-E_a/RT₂ + E_a/RT₁}

with T₁ = 300 K and T₂ = 65.0°C = 338 K

k₂ = 9.73 x 10^-5 s^-1

Équation d'Arrhenius - 3 | Cinétique chimique : Mécanismes

Chimie générale 2 - Équation d'Arrhenius - 3