Question

The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 110 grams of a radioactive isotope, how much will be left after 6 half-lives?
round to the nearest gram

Answer 1

$1) \ \frac{110}{2} = 55 \\2) \ \frac{55}{2} = 27.5 \\3) \ \frac{27.5}{2} = 13.75 \\4) \ \frac{13.75}{2} = 6.875 \\5) \ \frac{6.875}{2} = 3.4375 \\6) \ \frac{3.4375}{2} = 1.71875$

Since the question requires answer to be rounded, your answer is $2$ grams.