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 ?

Question

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 ? (A) 0.5 M (B) 1.25 M (C) 12.5 M (D) 1.0 M

Tardigrade Admin · Accepted Answer

For a zero order reaction Rate constant =k=(a-x/t) 2×10-2=(a-0.5/25) a=05=0.5 a= 1.0 M

Q. The rate constant of a zero order reaction is $2.0 \times 1 0^{- 2} m o l L^{- 1} s^{- 1}$ . If the concentration of the reactant after $25$ seconds is $0.5 M$ . What is the initial concentration ?

$0.5 M$

$1.25 M$

$12.5 M$

$1.0 M$

For a zero order reaction
Rate constant $= k = \frac{a - x}{t}$
$2 \times 1 0^{- 2} = \frac{a - 0.5}{25} < b r / > a = 05 = 0.5$
$a = 1.0 M$

Q. The rate constant of a zero order reaction is 2.0×10−2molL−1s−1. If the concentration of the reactant after 25 seconds is 0.5M. What is the initial concentration ?

0.5M

1.25M

12.5M

1.0M