Engineering
Chemistry
Integrated Rate Law
Question

The half life of the unimolecular elementary reaction 
A(g) → B(g) + C(g) is 6.93 min. How long will it take for the concentration of A to be reduced to 10 % of the initial value?

46 min

4.6 min

23.03 min

10.053 min

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Solution

0.6936.93×t=2.303 log[A]00.1[A]0 ⇒t=23.03 min