A sample of Th-219 requires 3.84 × 10−6 seconds to decay to 1.50 mg. What was the initial mass of the sample of Th-219? (t
1/2
for Th-219 = 1.05 × 10−6 s)
A
3.00 mg
B
5.90 mg
C
18.9 mg
D
37.8 mg
E
56.1 mg
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