Question

what is the half life period ?write mathematical expression for half life period for zero order reaction and first order reaction

Answer 1

Answer:

zero order reaction, the half life period is directly proportional to the initial concentration. For first-order reaction, the half-life period

Answer 2

Answer:

Explanation:

Half life reactions : The time elapsed in reduction of the concentration of a reactant participating in a chemical reaction to one half of its original concentration is called half-life reaction and is represented by t1/2.

Half-life for zero order reactions:

FORMULA : T1/2 = A/2k. ......(1)

At time t = 0 concentration of A (reactant) is a and B (product) is 0. At time t = t the concentration of A (reactant) is (a-x) and that of B (product) is x.

Thus finally arrived @equation(1)

For FIRST ORDER

FORMULA : T1/2 = 0.693/k

Derived from from it's general equation ,

t = 2.303/k1 log a/(a-x)

Extra note....

1. t1/2 of first order reaction is independent of initial concentration