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Author Question: A rock contains 0.153 mg of lead-206 for each milligram of uranium-238. The half-life for the decay ... (Read 149 times)

itsmyluck

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on: Aug 27, 2018
A rock contains 0.153 mg of lead-206 for each milligram of uranium-238. The half-life for the decay of uranium-238 to lead-206 is 4.5  109 yr. The rock was formed ________ years ago.
 
  A) 6.89  108
  B) 5.60  108
  C) 7.33  108
  D) 1.06  109
  E) 8.08  108

Question 2

The concentration of sodium sulfate solution is 18.6 by mass. There are ________ g of sodium sulfate present in a 236.5 g sample of this solution.
 
  A) 44.0
  B) 4400
  C) 0.000786
  D) 7.86
  E) 1270
Chemistry: The Central Science ¦ Brown, LeMay, Bursten ¦ 14th Edition
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TheDev123

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Reply #1 on: Aug 27, 2018
Answer to Question 1

D

Answer to Question 2

A


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itsmyluck

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Reply #2 on: Aug 27, 2018
Both answers were spot on, thank you once again


TheDev123

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Reply #3 on: Aug 27, 2018
Great! Please up vote :D


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