Answer to Question #182963 in General Chemistry for jvhvjhvj

Question

A reactant decomposes with a half-life of 39.5

39.5 s when its initial concentration is 0.322

0.322 M. When the initial concentration is 0.790

0.790 M, this same reactant decomposes with a half‑life of 96.9

96.9 s.

What is the order of the reaction?

1

2

What is the value and unit of the rate constant for this reaction?

Answer 1

From given data .

Half life is directly Proportional to Initial Concentration .

So, Order is " 2 " .

For Second order .

Unit of rate Constant = mol^-1 . lit¹ . Sec^-1 .

K = 1 / initial Concentration × Half life .

K = 1 / 0.322 × 39.5

K= 1 / 12.719

K= 0.079 mol^- . lit .sec^-1 .