Question

In the reaction, A -----> Products, the rate constant is 3.6 x 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 . Do NOT type in the unit (M).

Answer 1

0.529

Step-by-step explanation:

Let's consider the reaction A → Products

Since the units of the rate constant are s⁻1, this is a first-order reaction with respect to A.

We can find the concentration of A at a certain time t (
`[A]_(t)`) using the following expression.

`[A]_(t)=[A]_(0).e^(-k* t)`

where,

[A]₀: initial concentration of A

k: rate constant

`[A]_(t)=0.548M.e^{-3.6* 10^(-4)s^(-1)* 99.2s }`

`[A]_(t)=0.529 M`