The first-order integrated rate law for the reaction A → products is derived from the rate law using calculus:

The equation just given is a first-order, separable differential equation that can be solved by separating the variables and integrating:

In the integral just given, [A]₀ is the initial concentration of A.

We then evaluate the integral:

a. Use a procedure similar to the one just shown to derive an integrated rate law for a reaction A → products, which is onehalf order in the concentration of A (that is, Rate = k[A]1/2).

b. Use the result from part a to derive an expression for the halflife of a one-half-order reaction.

Transcribed Image Text:

Rate = k[A] (first-order rate law) d[A] Rate = dt d[A] dt -k[A]