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Exercise19.3Watches with numerals that glow in the dark” formerly were made by including radioactive radium in the paint used to letter the watch faces. Assume that to make the numeral 3 on a given watch, a sample of paint containing 8.0×10−7 mole of R22888a was used. This watch was then put in a drawer and forgotten. Many years later someone finds the watch and wishes to know when it was made. Analyzing the paint, this person finds 1.0×10−7 moles of R22888a in the numeral 3. Flow much time elapsed between the making of the watch and the finding of the watch?
Watches and clocks with radium dials.

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Chapter 19 Solutions
Introductory Chemistry: A Foundation
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