A 0160 g sample of rock was found to have 211 times 10-6


A 0.160 g sample of rock was found to have 2.11 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.11 × 10-6 mol of argon-40. How old was the rock? (What assumption is made about the origin of the argon-40?)

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Chemistry: A 0160 g sample of rock was found to have 211 times 10-6
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