Question

The time for half-life period of a certain reaction, $A\to$ Product, is $1$ hour, when the initial concentration of the reactant '$A$' is $2$ $mol$ $L^{-1}$. How much time does it take for its concentration to come from $0.50$ to $0.25$ $mol$ $L^{-1}$ if it is a zero order reaction?

• A. $0.25hr$
• B. $1hr$
• C. $4hrs$
• D. $0.5hr$

Answer 1

The correct option is A $0.25hr$

$\frac{t_1}{t_2}={\left(\frac{a_2}{a_1}\right)}^{n-1}$
$\frac{1}{t_2}={\left(\frac{0.5}{2}\right)}^{0-1}$
$t_2=0.25hr$