Question

What is the time taken to complete 75 percent of the reaction if the rate of the first-order reaction is 0.023 min^-1?

(a) 60.28 minutes

(b) 69.28 minutes

(c) 50.37 minutes

(d) 65.97 minutes

This question was posed to me by my college professor while I was bunking the class.

Question is from Chemical Kinetics in chapter Chemical Kinetics of Chemistry – Class 12

Answer 1

Right answer is (a) 60.28 minutes

The best I can explain: Given, the reaction is 75 complete so, a=75

Rate of the reaction k=0.023 min^-1

First-order integrated rate equation, k = \(\frac{2.303}{t}\)log\(\frac{100}{100-a}\)

t=\(\frac{2.303}{0.023}\)log\(\frac{100}{100-75}\) = 60.28 minutes.