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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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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 × 1 0 7 mole of R 88 228 a 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 × 1 0 7 moles of R 88 228 a in the numeral 3. Flow much time elapsed between the making of the watch and the finding of the watch?

Chapter 19.3, Problem 19.3SC, Exercise19.3Watches with numerals that glow in the dark” formerly were made by including radioactive

Watches and clocks with radium dials.

Interpretation Introduction

Interpretation:

Interpret the elapsing time for the finding of watch if initial number of mole of Ra present in watch was × 10-7mol while the present number of mole is 10-7 mole.

Concept Introduction:

The time elapsed can be identified through the below formula:

 (N /N0) = (1 /2)t /t half

N is number of mole left after time t

N0 is initial number of mole

Th a l f is half life.

Explanation

For determining time elapsed,

(N /N0) = (1 /2)t /t halfN = 1 × 10-7molN0= 8 × 10-7molT half = 1600&#

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