Solution: The radioactive potassium-40 isotope decays to
Chapter 19, Problem 19.74(choose chapter or problem)
The radioactive potassium-40 isotope decays to argon-40 with a half-life of 1.2 3 109 yr. (a) Write a balanced equation for the reaction. (b) A sample of moon rock is found to contain 18 percent potassium-40 and 82 percent argon by mass. Calculate the age of the rock in years
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