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KVPY2016ChemistryChemical Kinetics

It takes 1 ~h for a first order reaction to go to 50 % completion. The total time required for the same reaction to reach 87.5 % completion will be

Options

  1. A1.75 ~h
  2. B6.00 ~h
  3. C3.50 ~h
  4. D3.00 ~h

Correct answer

D. 3.00 ~h

Step-by-step solution

t _ 1 / 2 =1 hr t _ 87.5 = 2.303 k a a - x = 2.303 0.693 1 a a -.875 = 2.303 0.693 8= 2.303 0.693 3 .3010=3

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