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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?

You have to solve by Using 
N=N0(1/2) t/h

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Deanna L. | Electrical engineering major and music lover with MIT degreeElectrical engineering major and music l...
4.9 4.9 (129 lesson ratings) (129)
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!