For the hypothetical reaction A → products,the concentration of A was monitored with time.From the following graph,what is the rate constant for the decomposition of A?

Question

Quizplus · Accepted Answer

The rate constant (k) can be calculated using the formula:
k = - (1/t) *ln(Af/Ai)
where t = time elapsed, Ai= initial concentration, Af= final concentration

From the graph, we can see that Af / Ai = 0.5
t = 10 seconds

Putting in these values, we get:
k = - (1/10) * ln(0.5) = 0.07238 MS-1

Therefore, the correct choice is C.

For the Hypothetical Reaction a → Products,the Concentration of a Was