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A0.500 g sample of rock was found to have 2.45 × 106 mol of potassium-40 (t1/2 = 1.3 × 10° yr) and 2.45 x 10-6 mol of argon-40.

A0.500 g sample of rock was found to have 2.45 × 106 mol of potassium-40 (t1/2 = 1.3 × 10° yr) and 2.45 x 10-6 mol of argon-40.

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter20: Nuclear Chemistry
Section: Chapter Questions
Problem 20.98QP
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Part 2 How old was the rock? years old Save for Later
Transcribed Image Text:Part 2 How old was the rock? years old Save for Later
ew Policies how Attempt History Current Attempt in Progress A0.500 g sample of rock was found to have 2.45 × 106 mol of potassium-40 (t,/2 = 1.3 × 10° yr) and 2.45 x 10-6mol of argon-40. Part 1 Your answer is correct. What assumption should be made about the origin of the argon-40 if we want to determine the age of the rock? It must be assumed that all of the argon-40 that is found in the rock must have come from the potassium-40. It must be assumed that the amount of the argon-40 and the amount of the potassium-40 are equal. It must be assumed that the amount of argon-40 will increase with decreasing amount of potassium-40. It must be assumed that all of the potassium-40 that is found in the rock must have come from the argon-40. eTextbook and Media Attempts: 3 of 15 used
Transcribed Image Text:ew Policies how Attempt History Current Attempt in Progress A0.500 g sample of rock was found to have 2.45 × 106 mol of potassium-40 (t,/2 = 1.3 × 10° yr) and 2.45 x 10-6mol of argon-40. Part 1 Your answer is correct. What assumption should be made about the origin of the argon-40 if we want to determine the age of the rock? It must be assumed that all of the argon-40 that is found in the rock must have come from the potassium-40. It must be assumed that the amount of the argon-40 and the amount of the potassium-40 are equal. It must be assumed that the amount of argon-40 will increase with decreasing amount of potassium-40. It must be assumed that all of the potassium-40 that is found in the rock must have come from the argon-40. eTextbook and Media Attempts: 3 of 15 used
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