Answer to Question #121122 in Chemistry for zainab

Question

he rate constant of the reaction is 10.5 x 10*-3 when hcl conc is 0.1 mol. calculate second order rate constant

Answer 1

The pseudo-1^st order rate constant is introduced as the product of the second-order rate constant and the concentration of a reactant, for which the concentration remains quasi-constant during the reaction:

$k' = k[A]$ .

The molar concentration of the reagent A (here HCl) is 0.1 M. Therefore, the second order rate constant is:

$k = \frac{k'}{[HCl]} = \frac{10.5·10^{-3}}{0.1} = 10.5·10^{-2}$ s^-1 M^-1.

Answer: the second order rate constant is 0.105 s^-1 M^-1.