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).

0.529

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 () using the following expression.

where,

[A]₀: initial concentration of A

k: rate constant

the answer is b & c i believe : )