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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 __________ yr.

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Nuclear chemistry is a branch of chemistry that studies radioactivity, nuclear processes, and changes in the nuclei of atoms.


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 __________ yr.






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