Top Posters
Since Sunday
5
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
New Topic  
fnmw fnmw
wrote...
Go to Answer
Posts: 116
Rep: 0 0
3 years ago
An archaeological sample contains 0.700 g of lead-206 and 2.144 g of uranium-238. Assume that all the lead now present in the rock came from the radioactive decay of the uranium and that no appreciable amounts of other radioactive nuclides are present in the sample. The decay rate constant for the uranium is 1.54 × 10–10/year. What is the age of the sample?


▸ 8.41 × 109 years

▸ 9.03 × 108 years

▸ 2.08 × 109 years

▸ 6.33 × 109 years

▸ None of these are correct.
Textbook 
Chemistry: An Atoms First Approach

Chemistry: An Atoms First Approach


Edition: 3rd
Authors:
Read 339 times
3 Replies
Replies
Answer verified by a subject expert
kennettjkennettj
wrote...
#1
Posts: 99
Rep: 0 0
3 years ago
Sign in or Sign up in seconds to unlock everything for free
More solutions for this book are available here
1

Related Topics

wrote...
#2
2 years ago
thank you
wrote...
#3
10 months ago


Half life = 0.693 / k

k = 1.537 x 10-10 year

Half life = 0.693 / 1.537 x 10-10 = 4.509 x 109 Years

Hence answer is option A
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1263 People Browsing
 102 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 205
  
 4428
  
 924
Your Opinion
Which of the following is the best resource to supplement your studies:
Votes: 249
Previous poll results: What's your favorite math subject?