Neco Model Questions Vol1 2019 Chemistry Question 40
Practice objective / multiple choice question 40 from the 2019 Neco Model Questions Vol1 Chemistry examination.
The oxidation of 1‑butanol by acidic dichromate follows the rate law \(rate = k[Cr_{2}O_{7}^{2-}][RCH_{2}OH][H^{+}]\). At 25 °C, \(k = 2.5\times10^{-3}\) M⁻² s⁻¹. The initial concentrations are \([Cr_{2}O_{7}^{2-}] = 0.010\) M, \([1\text{-butanol}] = 0.050\) M and \([H^{+}] = 0.100\) M. (i) Assuming the concentrations of dichromate and hydrogen ion remain essentially constant, calculate the time required for 75 % conversion of the alcohol. (ii) If the reaction is carried out at 35 °C and the activation energy is \(E_{a}=45\) kJ mol⁻¹, estimate the new rate constant using the Arrhenius equation and then compute the time for 75 % conversion at 35 °C.
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This is Neco Model Questions Vol1 2019 Chemistry Question 40. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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