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OpenStudy (anonymous):
a rock from \the moon contains 12.5% of the potassium-40 it began with. how old is the rock?
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OpenStudy (wolfe8):
Welcome to OpenStudy. First you want to find out the half-life of potassium-40. Then you want to see how many times you will divide 100% mass by 2 to reach 12.5%
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