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For a zero-order reaction, if the initial concentration is 0.5 M and the rate co

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Question: For a zero-order reaction, if the initial concentration is 0.5 M and the rate constant is 0.1 M/s, how long will it take to reach 0 M? (2019)

Options:

  1. 5 s
  2. 10 s
  3. 15 s
  4. 20 s

Correct Answer: 10 s

Solution: 

For a zero-order reaction, t = [A₀] / k. Here, t = 0.5 M / 0.1 M/s = 5 s.

For a zero-order reaction, if the initial concentration is 0.5 M and the rate co

Practice Questions

Q1
For a zero-order reaction, if the initial concentration is 0.5 M and the rate constant is 0.1 M/s, how long will it take to reach 0 M? (2019)
  1. 5 s
  2. 10 s
  3. 15 s
  4. 20 s

Questions & Step-by-Step Solutions

For a zero-order reaction, if the initial concentration is 0.5 M and the rate constant is 0.1 M/s, how long will it take to reach 0 M? (2019)
  • Step 1: Identify the initial concentration of the reactant, which is given as 0.5 M.
  • Step 2: Identify the rate constant, which is given as 0.1 M/s.
  • Step 3: Use the formula for a zero-order reaction, which is t = [A₀] / k.
  • Step 4: Substitute the values into the formula: t = 0.5 M / 0.1 M/s.
  • Step 5: Perform the division: 0.5 M divided by 0.1 M/s equals 5 seconds.
  • Step 6: Conclude that it will take 5 seconds to reach 0 M.
  • Zero-Order Reactions – In zero-order reactions, the rate of reaction is constant and independent of the concentration of the reactant.
  • Rate Constant – The rate constant (k) is a proportionality factor that relates the rate of reaction to the concentration of reactants in zero-order kinetics.
  • Time Calculation – The time required to reach zero concentration can be calculated using the formula t = [A₀] / k.
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