Chemical Kinetics Question 114

Question: A first order reaction requires 30 minutes for 50% completion. The time required to complete the reaction by 75% will be

Options:

A) 45 minutes

B) 15 minutes

C) 60 minutes

D) None of these

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Answer:

Correct Answer: C

Solution:

$ k=\frac{0.693}{30}=0.0231 $ ; $ t=\frac{2.303}{k}\log ( \frac{100}{100-75} ) $

$ t=\frac{2.303}{0.0231}\log 4=60,minutes $



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