Answer:
Step-by-step explanation:
The half-life of 20F is 11.0 s. If a sample initially contains 5.00 g of 20F, how much 20F remains after 44.0 s?
Solution
If we compare the time that has passed to the isotope’s half-life, we note that 44.0 s is exactly 4 half-lives, so we can use Equation ???
with n=4
. Substituting and solving results in the following:
amountremaining=5.00g×(12)4=5.00g×116=0.313g
Less than one-third of a gram of 20F remains.