Question

The rate constant of a chemical reaction at a very high temperature will approach:

• A. Arrhenius frequency factor divided by the ideal gas constant
• B. Activation energy
• C. Arrhenius frequency factor
• D. Activation energy divided by the ideal gas constant

Answer 1

The correct option is C Arrhenius frequency factor

$K=A{e}^{-\frac{E_a}{RT}}$

At very high temp,

$k=A{e}^{-Ea/RT};$

$AtT\underset{-}{\to }\infty ;k=A{e}^{-E_A[R\times \infty ]}=A{e}^{\circ }$

Therefore, $K=A$ at high temperature.

A is termed as Arrhenius frequency factor.

Hence, option C is correct.