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One isotope of chromium has a half life of 18 hours. How long does it take 100 grams to decay to 20 grams?

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1 Answer

Diana here N=20, N0=100, t=18, making the final equation to solve 20/100= .5^(18/h)
 
Take the log of both sides- log .2=(18/h)*log .5
H=18*log .5/log .2=7.752 hours
 
HOpe that helps!
Deanna