first order reaction उदाहरण वाक्य

One way to obtain a pseudo-first order reaction is to use a large excess of one of the reactants ( [ B ] k " [ A ] ) that works in the previous example ) so that, as the reaction progresses, only a small amount of the reactant is consumed, and its concentration can be considered to stay constant.
As an example, the steady state approximation will be applied to two consecutive, irreversible, homogeneous first order reactions in a closed system . ( For heterogeneous reactions, see reactions on surfaces . ) This model corresponds, for example, to a series of nuclear decompositions like ^ { 239 } U-> ^ { 239 } Np-> ^ { 239 } Pu \ !.
This free-energy relationship relates the pseudo first order reaction rate constant ( in water at 25 �C ), " k ", of a reaction, normalized to the reaction rate, " k " 0, of a standard reaction with water as the nucleophile, to a nucleophilic constant " n " for a given nucleophile and a substrate constant " s " that depends on the sensitivity of a substrate to nucleophilic attack ( defined as 1 for methyl bromide ).