Question

The rate constant, the activation energy and the Arrhenius parameter of the chemical reaction at ${25}^{\circ }C$ are $3.0\times {10}^{-4}{s}^{-1}$, $104.4kJmo{l}^{-1}$ and $6\times {10}^{14}{s}^{-1}$ respectively. The value of rate constant at infinite temperature:

• A. $2.0\times {10}^{18}{s}^{-1}$
• B. $6.0\times {10}^{14}{s}^{-1}$
• C. Infinity
• D. $3.6\times {10}^{30}{s}^{-1}$

Answer 1

Answer: (B)

$6.0\times {10}^{14}{s}^{-1}$

As we know,
rate constant $k=A{e}^{-E_a/RT}$ so for this reaction rate constant at infinite temp. is
$ln\left(k_2/k_1\right)=E_a/R(1/T_1-1/T_2)$ so
$k_2=6.0\times {10}^{14}{s}^{-1}$