× Didn't find what you were looking for? Ask a question
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
New Topic  
Whelan Whelan
wrote...
Posts: 3158
8 years ago
A researcher needs 5.00 mg of 128Ba for an experiment. If the half-life of 128Ba is 2.43 days, how many milligrams of 128BaCl2 must she order from the manufacturer if it takes 4.50 days to ship the material from the manufacturer to the university? (Assume the molar mass of 128Ba is 128 g/mol.)
A) 11.6 mg
B) 18.0 mg
C) 21.5 mg
D) 44.9 mg
Textbook 
Introductory Chemistry Essentials

Introductory Chemistry Essentials


Edition: 5th
Author:
Read 829 times
1 Reply

Related Topics

Replies
wrote...
8 years ago
B?
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1288 People Browsing
Related Images
  
 155
  
 4869
  
 912
Your Opinion
Which 'study break' activity do you find most distracting?
Votes: 741

Previous poll results: Do you believe in global warming?