Question

The rate constant of the reaction A → B is 0.6 × 10⁻³ mole per
second. If the concentration of A is 5 M then concentration
of B after 20 minutes is : [2015 RS]
(a) 1.08 M (b) 3.60 M
(c) 0.36 M (d) 0.72 M

Answer 1

The concentration of A is 5 M then concentration of B after 20 minutes is

x = 0.72 M

Option (D) is correct.

Explanation:

The rate constant has unit mole per second which indicates zero order reaction.

x = k.t

The concentration of B after 20 minutes is

x = 20×60×0.6×10^−3

x = 0.72 M

Thus the concentration of A is 5 M then concentration of B after 20 minutes is

x = 0.72 M

Also learn more

In a first order reaction, the concentration of the reactant is reduced from 0.6 mol L⁻¹ to 0.2 mol L⁻¹ in 5 mins. Calculate the rate constant of the reaction.  ?

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