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MHT CET202120 Sep 2021Evening ShiftChemistryChemical KineticsActual

Half-life for a first order reaction is 6.93 hour. What is the time required for 80 % completion of the reaction?

Options

  1. A12 hours
  2. B18 hours
  3. C6 hours
  4. D16 hours

Correct answer

D. 16 hours

Step-by-step solution

For first order reaction, k = 0.693 t _ 1 2 = 0.693 6.93 =0.1 hour ⁻¹ Here, [ A ]₀=100,[ ~A ]_ t =100-80=20 aligned & Now, k = 2.303 t ₁₀ [ A ]₀ [ ~A ]_ t & t = 2.303 0.1 ₁₀ 100 20 =23.03 ₁₀ 5=23.03 0.699 & =16.10 hours. aligned

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