The radioactive potassium-40 isotope decays to argon-40
Chapter 20, Problem 82AP(choose chapter or problem)
The radioactive potassium-40 isotope decays to argon-40 with a half-life of 1.2 × 109 years,(a) Write a balanced equation for the reaction,________________(b) A sample of moon rock is found to contain 18 perccnt potassium-40 and 82 percent argon by mass. Calculate the age of the rock in years. (Assume that all the argon in the sample is the result of potassium decay.)
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