In the reaction, A → Products, the rate constant is 3.6 × 10−4 s−1. If the initial concentration of A is 0.548 M, what will be the concentration of A (in M) at t = 99.2 s? Only enter the numerical value with three significant figures in the answer box below. Do NOT type in the unit (M).

Respuesta :

Answer:

        [tex]\large\boxed{\large\boxed{0.529M}}[/tex]

Explanation:

Since the rate constant has units of s⁻¹, you can tell that the order of the reaction is 1.

Hence, the rate law is:

       [tex]r=d[A]/dt=-k[A][/tex]

Solving that differential equation yields to the well known equation for the rates of a first order chemical reaction:

      [tex][A]=[A]_0e^{-kt}[/tex]

You know [A]₀, k, and t, thus you can calculate [A].

       [tex][A]=0.548M\times e^{-3.6\cdot 10^{-4}/s\times99.2s}[/tex]

       [tex][A]=0.529M[/tex]

The value of the concentration of A is 0.529.

Since the rate constant has units of s⁻¹, we can tell that the order of the reaction is 1.

Rate of first -order reaction,

[tex](A)=A_{0} e^{-kt}[/tex]

Here, [tex]A_{0}[/tex] is the initial concentration, t is the time, A is the final concentration, and k is the rate constant.

Substitute the given value values in the equation as follows,

[tex](A)=0.548M e^{-3.6*10^{-4s^{-1}\times99.2s } } \\=0.529M[/tex]

The concentration of A in (M) is 0.529.

Find more information about first- order reaction here,

brainly.com/question/13309369