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Question: Answered & Verified by Expert
A first order reaction has a specific reaction rate of 102sec-1 . How much time will it take for 20 g of the reactant to reduce to 5 g?
ChemistryChemical KineticsNEET
Options:
  • A 138.8 sec
  • B 346.5 sec
  • C 693.0 sec
  • D 238.6 sec
Solution:
1279 Upvotes Verified Answer
The correct answer is: 138.8 sec
It is based on first order kinetics so using the given relation
K=2.303tlog10N0NT
t=2.30310-2×log10205
On solving t=138.87 sec.

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