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? asked in Science & MathematicsChemistry · 3 years ago

Chem activation energy?

The reaction below in a certain solvent is first order with respect to (CH3)3CBr and zero with respect to OH -.

(CH3)3CBr + OH - (CH3)3COH + Br -

In several experiments, the rate constant k was determined at different temperatures. A plot of ln(k) versus 1/T was constructed resulting in a straight line with a slope of -1.10 ✕ 104 K and y-intercept of 33.5. Assume k has units of s-1.

A)Determine the activation energy for this reaction.

B)Determine the value of the frequency factor A.

C) Calculate the value of k at 25°C.

1 Answer

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  • DavidB
    Lv 7
    3 years ago

    Arrhenius equation

    k = A.e^(-Ea/RT)

    take ln of each side

    ln k = -Ea/RT + ln A

    so graph of ln k vs 1/T has a slope -Ea/R and intercept of ln A. When you know Ea and A you can calculate k at any temp using either equation.

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