12) The reaction 2NO_(2)arrow 2NO+O_(2) follows second-order kinetics.At 300^circ C,[NO_(2)] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is __ M^-1s^-1 A) 0.096 B) 0.65 C) 0.81 D) 1.2 E) 0.54 Answer: E

Question

Answer 1

To determine the rate constant for the reaction, we can use the integrated rate law for a second-order reaction:

where:-

is the final concentration of the reactant,-

is the initial concentration of the reactant,-

is the rate constant,-

is the time.Given:-

-

Substitute these values into the integrated rate law equation:

Calculate the left-hand side:

Now, solve for

:

Rounding to two decimal places, we get:

Thus, the correct answer is:E) 0.54

Soru