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In a first-order reaction, if the concentration of reactant decreases from 0.8 M to 0.2 M in 20 minutes, what is the rate constant? (2022)

Practice Questions

1 question
Q1
In a first-order reaction, if the concentration of reactant decreases from 0.8 M to 0.2 M in 20 minutes, what is the rate constant? (2022)
  1. 0.0347 min⁻¹
  2. 0.0693 min⁻¹
  3. 0.1 min⁻¹
  4. 0.2 min⁻¹

Questions & Step-by-step Solutions

1 item
Q
Q: In a first-order reaction, if the concentration of reactant decreases from 0.8 M to 0.2 M in 20 minutes, what is the rate constant? (2022)
Solution: Using the first-order rate equation, k = (ln[A₀] - ln[A]) / t. Here, k = (ln(0.8) - ln(0.2)) / 20 = 0.0347 min⁻¹.
Steps: 0

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