Answer:
Amount remaining are 62.5 g , 50 g and 75 g respectively.
Step-by-step explanation:
We have an isotope that has a half life of 25 days that means after 25 days, the initial amount would reduce to its half.
If a given duration can be expressed as [tex]2^{n}[/tex] , then
the amount remaining = [tex]\frac{initial amount}{2^{n} }[/tex]
Start with 1,000 grams, find the amount after 100 days
Amount remaining = [tex]\frac{1000}{2^{4} }[/tex] = 62.5 gram
Start with 400 grams , find the amount after 75 days.
Amount remaining = [tex]\frac{400}{2^{3} }[/tex] = 50 grams
Start with 300 grams , find the amount after 50 days
Amount remaining = [tex]\frac{300}{2^{2} }[/tex] = 75 grams
