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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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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