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Question

32P has a half life of 14.3 days. If initially there are 50.0g of it, how many grams of it remain after times of

A. 14.3 days

B. 28.6 days

C. 42.9 days.

Answer 1

A) this is one half life , where half of the amount remains so 25g of 32P remains

B) This is two half lives, where (0.5*0.5)=0.25 , a quarter of the amount remains= 50/4= 12.5g of 32P remains

C) This is 3half lives, where (0.5*0.5*0.5) = 0.125, an eighth of the original amount remains= 50/8= 6.25g of 32P remains.

Answer 2

A) 25 g

B) 12.5 g

C) 6.25 g