Chemical Kinetics Question 344

Question: If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is

Options:

A) 16g

B) 2g

C) 32g

D) 8g

Show Answer

Answer:

Correct Answer: D

Solution:

[d] $ {t_{1/2}}=5 $ years, T= 15 years hence total number of half life periods $ =\frac{15}{5}=3 $
$ \therefore Amountleft=\frac{64}{{{(2)}^{3}}}=8g $



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