The rate constant of the reaction A → B is 0.6 ˣ 10⁻³ mol per second.

The rate constant of the reaction A → B is 0.6 ˣ 10⁻³ mol per second. If the concentration of A is 5 M, then concentration of B after 20 minutes is

Options

(a) 3.60 M
(b) 0.36 M
(c) 0.72 M
(d) 1.08 M

Correct Answer:

0.72 M

Explanation:

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View Comments (2)

  • Reaction is of zero order as the unit of rate constant is mol L⁻¹ S⁻¹
    .·. Concentration of B =k × t =0.6×10⁻³ × 20 × 60 = 0.72 M

  • Let at time t=0 (A)= a and (B)=0
    At time t=(20*60)sec (A)= (a-x) and (B)=x then
    For 1st order reaction
    (A') =(A) - kt
    : a-x = a - 0.6*10-3*20*60
    Solving it will give
    X= 0.72 M

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