Chemical Kinetics and Nuclear ChemistryHard

Question

For a first order reaction, (A) → products, theconcentration of A changes from 0.1 M to0.025 M in 40 minutes. The rate of reactionwhen the concentration of A is 0.01 M is :-

Options

A.1.73 × 10-4 M/min
B.1.73 × 10-5 M/min
C.3.74 × 10-4 M/min
D.3.74 × 10-5 M/min

Solution

For first order reaction

Given [A]0 = 0.1 M, [A]t = 0.025 M
∴
Rate = K [A]1
0.01 = 0.0003465 M/min
= 3.47 × 10-4 M/min

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