Question 81859
A half life means that half of the material (half of 7,945 grams) is gone in a matter of time (3 hours).
y = a(1/2)^x
Where {{{y}}} is the amount left; {{{a}}} is the initial amount; {{{x}}} is the amount of times a half life has occurred....
y = 7,945(1/2)^(48/3) .... after every 3 hours of 48 hours a half life has occurred
y = 7,945(1/2)^(16)
About 0.1212310791015625 grams ....