Cobalt-60 has a half-life of 5.26 years. If 3.03 g of 60 Co were allowed to decay, how many grams would be left after (a) one half life? g (b) two

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Cobalt-60 has a half-life of 5.26 years. If 3.03 g of 60Co were allowed to decay, how many grams would be left after

(a) one half life? 

 g

(b) two half lives? 

 g

(c) four half lives? 

 g

(d) ten half lives? 

 g

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