The radioactive potassium-40 isotope decays to argon-40 with a half-life of 1.2 109 yr. (a) Write
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(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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a The balanced equation is b First c...View the full answer
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