Question

Rate constant for zero order reaction is 2 × 10^-2 mol L^-1 s^-1. If the concentration of the reactant after 25 sec. is 0.5 M, what is the initial concentration of reactant?

पर्याय

• 0.125 M

• 0.5 M

• 1.25 M

• 1.0 M

Answer 1

1.0 M

Explanation:

For zero order reaction,

k = `(["A"]_0 - ["A"]_"t")/"t"`

`2 xx 10^-2 = (["A"]_0 - 0.5)/25`

0.5 + 0.5 = [A]₀

∴ [A]₀ = 1.0 M