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If the rate of a reaction is 0.05 M/s when the concentration of reactant A is 0.

Practice Questions

Q1
If the rate of a reaction is 0.05 M/s when the concentration of reactant A is 0.1 M, what is the rate constant k for a first-order reaction?
  1. 0.5 s^-1
  2. 1.0 s^-1
  3. 0.05 s^-1
  4. 0.1 s^-1

Questions & Step-by-Step Solutions

If the rate of a reaction is 0.05 M/s when the concentration of reactant A is 0.1 M, what is the rate constant k for a first-order reaction?
  • Step 1: Identify the formula for the rate of a first-order reaction, which is rate = k[A].
  • Step 2: Rearrange the formula to solve for the rate constant k, so k = rate / [A].
  • Step 3: Substitute the given values into the formula: rate = 0.05 M/s and [A] = 0.1 M.
  • Step 4: Calculate k by dividing the rate (0.05 M/s) by the concentration of A (0.1 M).
  • Step 5: Perform the calculation: k = 0.05 M/s / 0.1 M = 0.5 s^-1.
  • First-Order Reaction – A reaction where the rate is directly proportional to the concentration of one reactant.
  • Rate Constant (k) – A proportionality constant that relates the rate of a reaction to the concentration of reactants in a first-order reaction.
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