What is the rate law for a first order reaction?

A first-order reaction has a rate law in which the sum of the exponents is equal to 1. In a firstorder reaction, the reaction rate is directly proportional to the concentration of one of the reactants. A firstorder reaction depends on the concentration of one reactant, and the rate law is:

r=−dAdt=k[A] r = − dA dt = k [ A ] .

For a firstorder reaction, a plot of the natural logarithm of the concentration of a reactant versus time is a straight line with a slope of −k.

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