Answer:
The correct answer is 5.61 × 10⁻⁵.
Explanation:
Based on the given information, let us consider the experimentally determined value of K as 0.000717, with the value of T₁ as 45 degree C, the value of T₁ in Kelvin would be,
T₁ = 273 +45 = 318 K
The value of T₂ is 25 degree C, or (25+273) = 298 K
Based on Arrhenius equation:
ln(K₂/K₁) = -Ea/R(1/T₂ - 1/T₁)
Now putting the values in the equation we get,
ln(K₂/0.000717) = -12070 (1/298 - 1/318)
ln(K₂/0.000717) = -2.54738
K₂/0.000717 = e^-2.54738 = 0.078286
K₂ = 0.078286 × 0.000717
K₂ = 5.61 × 10⁻⁵