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Author Question: Potassium-40 decays to argon-40 with a half-life of 1.27 109 yr. The age of a mineral sample that ... (Read 78 times)

formula1

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on: Jul 8, 2021

Question 1

Phosphorus-32 has a half-life of 14.3 days. How many grams remain from a 10.0 gram sample after 30.0 days?
◦ 2.34 g
◦ 7.18 g
◦ 4.64 g
◦ 0.340 g
◦ 3.59 g

Question 2

Potassium-40 decays to argon-40 with a half-life of 1.27 × 109 yr. The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.812 is ________ y.
◦ 1.56 × 109
◦ 1.02 × 109
◦ 1.47 × 109
◦ 7.55 × 108
◦ 1.09 × 109
General Chemistry: Principles and Modern Applications ¦ Petrucci, Herring, Madura, Bissonnette ¦ 11th Edition
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Marked as best answer by formula1 on Jul 8, 2021

bigsis44

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Reply #1 on: Jul 8, 2021
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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formula1

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Reply 2 on: Jul 8, 2021
Excellent

Joy Chen

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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