The half-life of 
is 24 minutes.A freshly prepared sample is allowed to sit for 2.0 hours.If the mass of the sample after this period of time is 1.0 mg,what was the original sample mass?
A) 0.031 mg
B) 1.3 mg
C) 5.0 mg
D) 32 mg
E) 3.2* 102 mg
Correct Answer:
Verified
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