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leva [86]
3 years ago
8

PLEASE HELP!!!!!!!!!! DOING A TEST

Chemistry
2 answers:
Arturiano [62]3 years ago
6 0

Answer:

answer is D) carbohydrates

Nastasia [14]3 years ago
4 0
D is the correct answer
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Thallium-207 decays exponentially with a half life of 4.5 minutes. if the initial amount of the isotope was 28 grams, how many g
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An exponential decay law has the general form: A = Ao * e ^ (-kt) =>

A/Ao = e^(-kt)

Half-life time => A/Ao = 1/2, and t = 4.5 min

=> 1/2 = e^(-k*4.5) => ln(2) = 4.5k => k = ln(2) / 4.5 ≈ 0.154

Now replace the value of k, Ao = 28g  and t = 7 min to find how many grams of Thalium-207 will remain:

A = Ao e ^ (-kt) = 28 g * e ^( -0.154 * 7) = 9.5 g

Answer 9.5 g.
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