what is the unit of rate constant for second order reaction
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In a second-order reaction, the sum of the exponents in the rate law is equal to two. The two most common forms of second-order reactions will be discussed in detail in this section.
Reaction Rate
Integration of the second-order rate law
d[A]dt=−k[A]2. (1.1)
yields
1[A]=1[A]0+kt. (1.2)
which is easily rearranged into a form of the equation for a straight line and yields plots similar to the one shown on the left below.
The half-life is given by
t1/2=1k[Ao]. (1.3)
Notice that the half-life of a second-order reaction depends on the initial concentration, in contrast to first-order reactions. For this reason, the concept of half-life for a second-order reaction is far less useful. Reaction rates are discussed in more detailhere. Reaction orders are defined here.Here are explanations of zeroand first order reactions.
Reaction Rate
Integration of the second-order rate law
d[A]dt=−k[A]2. (1.1)
yields
1[A]=1[A]0+kt. (1.2)
which is easily rearranged into a form of the equation for a straight line and yields plots similar to the one shown on the left below.
The half-life is given by
t1/2=1k[Ao]. (1.3)
Notice that the half-life of a second-order reaction depends on the initial concentration, in contrast to first-order reactions. For this reason, the concept of half-life for a second-order reaction is far less useful. Reaction rates are discussed in more detailhere. Reaction orders are defined here.Here are explanations of zeroand first order reactions.
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