Problems 7077 are based on material learned earlier in the course. The purpose of these problems is
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Problems 70–77 are based on material learned earlier in the course. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for the final exam.
The half-life of uranium-232 is 68.9 years. If 25 grams is present now, how much will be present in 40 years?
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