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Chemistry

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14) A sample contains 1.46 g of Cobalt-55. After 2.00 days, 0.219 g remains. What is the half-life?
A) 11.6h-1
B) 22.6h-1
C) 1.35 h-1
D) 17.5h-1
E) 0.540 h

Answer :

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