Suppose the half-life of element k is 20 minutes. if you have a 200 g sample of k, how much of element k will be left after 60 minutes? (do not use significant digits in answering this question).

Question

Chemistry

Aldo Reese

7 January, 05:26

Suppose the half-life of element k is 20 minutes. if you have a 200 g sample of k, how much of element k will be left after 60 minutes? (do not use significant digits in answering this question).

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Answers (1)

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Emilio Barber · Answer 1

T=20 min

m₀=200 g

t=60 min

the mass of element through time t is:

m=m₀*2^ (-t/T)

m=200*2^ (-60/20) = 25 g

25 grams of element will be left after 60 minutes