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  3. Chemistry
  4. The rate constant of a zero order reaction is 2.0 × 10-2 mol L-1 s-1. If the concentration of the reactant after 25 seconds is 0.5 M. What is the initial concentration ?

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Q. The rate constant of a zero order reaction is $2.0 \times 10^{-2}\, mol \,L^{-1}\, s^{-1}$. If the concentration of the reactant after $25$ seconds is $0.5\,M$. What is the initial concentration ?

JEE MainJEE Main 2013Chemical Kinetics

Solution:

For a zero order reaction
Rate constant $=k=\frac{a-x}{t}$
$2\times10^{-2}=\frac{a-0.5}{25}
a=05=0.5$
$a= 1.0\,M$