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The rate constant of a reaction is 1.25 * 10⁻⁴ mol/L/s. If the initial concentration of the reactant is 0.250 mol/L, what is the total time (in minutes, to the nearest integer) required for the reactant to be completely consumed?
- (A) 33
- (B) 40
- (C) 25
- (D) 20
Correct answer: (A) 33
Solution
The units of k are mol/L/s, which correspond to a zero-order reaction. In a zero-order reaction the concentration decreases linearly with time, reaching zero at t = [A]₀ / k.
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