Question

What is the expected forward constant at 300K, if we initiate this reaction starting with only reactant?

• A. 10${}^2$
• B. 10${}^6$
• C. 10${}^8$
• D. 10${}^4$

Answer 1

The correct option is B 10${}^6$

The Arrhenius equation is $log{K}_o=logA-\frac{Ea}{2.303RT}$

Substitute values in the above expression,

$log{K}_b=12-\frac{57450}{2.303\times 8.314\times 300}$

$Log{K}_b=2$

$K_b=\text{Antilog}2$

$K_b={10}^2$

Now,

$K_c=\frac{K_f}{K_b}$

${10}^4=\frac{K_f}{{10}^2}$

$K_f={10}^6$

Thus, the expected forward constant at 300K is ${10}^6$.