1mg
0.25
1 mg
1 mg
2.5
This would depend on the specific sample and its stability. Without additional information, it is not possible to determine how much of the sample would remain unchanged after two hours.
1mg
0.5 mg
0.25
1 mg
After 132 hours, 1/4 of the initial sample of 10 Ci of Mo-99 would remain. Since the half-life is 66 hours, after 66 hours half of the sample would remain (5 Ci), and after another 66 hours (totaling 132 hours), half of that remaining amount would be left.
.25 mg
1 mg
0.25 mg
1 mg
1 mg
2.5