The half-life of the radioactive nuclide 
is 9.0 min.What is the activity of a 4.7-µg sample of 
? The molar mass of 
Is 78.921 g/mol.(1 Ci = 3.700 × 1010 disintegrations/s)
A) 1.8×103Ci
B) 1.1×105Ci
C) 1.2×103Ci
D) 7.5×104Ci
E) 1.1×10-10Ci
Correct Answer:
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