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**skeske1234** Alcheny is the ancient study of turning substances into gold using chemical or sometimes magical means. When platinum 197 undergoes a nuclear process known as beta decay, it becomes gold 197, which is a stable isotope. The half life of platinum 197 is 20 h.

a) how long would it take to turn 90 percent of a 1 kg sample of platinum 197 into gold?

b) do you think this is a viable "get rich quick" scheme? why or why not?

my work:

for part a) I used the equation

**0.10**=(1/2)^t/20

and then solved for t

but I cant get the right answer in the back of the book

for part b) if i used the answer in the back, which is 66.4 h, then would b) be yes it is a viable trick because it only takes 2.5 days to get the gold? correct me if i am wrong and state why please