Question

Define half-life of a reaction. Write the expression of half-life for

(i) zero order reaction and (ii) first order reaction


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Answer 1

Answer:

Half life of a reaction is the amount of time in which 50% of the initial amount of reactant is consumed.

Explanation:

For zero order reaction

Half life=

$t = \frac{(a)}{2k}$

where (a) is initial concentration of the reactant

k is rate constant.

For first order reaction

Half life=

$\frac{ ln(2) }{k} = \frac{0.693}{k}$

where k is rate constant.