Chemistry
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ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Calculate a K-Ar date for a sample of biotite from a gneiss containing K2O =9.00 wt%, 40Ar=2.424 mg/g. Decay constants: le = 0.581 x10-10a-1; l = 5.543 x10-10a-1; atomic abundance of 40K = 0.01167%; atomic weights: K=39.098, O= 15.999, 40Ar =39.96. And assume no inherited 40Ar.
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