Iodine131 is a radioactive isotope. after 7.00 days, 54.7% of a sample of 131i remains. what is the halflife of 131i?
Chemistry
Boov1peaiyash
Question
Iodine131 is a radioactive isotope. after 7.00 days, 54.7% of a sample of 131i remains. what is the halflife of 131i?
2 Answer

1. User Answers kisahiro1357924680
Iodine131 has a halflife of 8 days. 
2. User Answers maacastrobr
Answer:
The halflife of ¹³¹I is 8.04 days.
Explanation:
We can calculate the halflife of 131I using the formula:
 0.547 = (0.5)[tex]^{7.00/\alpha }[/tex]
Where 0.547 is the percentage of the sample that remains, 7.00 is the amount of days that have passed, and α is the halflife.
We use Log on both sides of the equation:
 0.262 = 0.301 * (7.00 / α)
And solve for α:
α = 8.04 days