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The half life of Uranium-238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6 g is found to produce 29 dis/s. Assuming all the radioactivity is due to Uranium 238, find the percent by mass of Uranium 238 in the rock.
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How many grams of nitrogen are found in 50.0 grams of potassium nitrate?
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