57 A radioactive element X decreases from 360 mg to 90 mg in 1800 seconds. What is the half life of X?    15 s   15 min   15 min-1   150 s

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter18: Nuclear Chemistry
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57

A radioactive element X decreases from 360 mg to 90 mg in 1800 seconds. What is the half life of X? 

 
  1. 15 s

     
  2. 15 min

     
  3. 15 min-1

     
  4. 150 s

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