Question

The rate constant, the activation energy and the frequency factor of a chemical reaction at ${25}^0$C are $3.0\times {10}^{-2}{s}^{-1},104.4KJmo{l}^{-1}$ and $6.0\times {10}^{14}{s}^{-1}$, respectively. The value of the rate constant as $T\to \infty$ is:

• 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)

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

$k=A{e}^{-E_a/RT}$

At T = Infinity, $\frac{1}{T}$ becomes =0. So,

$k=A{e}^0$

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