× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
y
2
s
2
2
a
1
w
1
w
1
i
1
m
1
s
1
c
1
k
1
1
Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
New Topic  
Think Think
wrote...
Posts: 2431
Rep: 21 1
9 years ago
You have 10.0 g each of Na, C, Pb, Cu and Ne. Which contains the largest number of moles?
A) Na
B) C
C) Pb
D) Cu
E) Ne

Textbook 
Introductory Chemistry Essentials

Introductory Chemistry Essentials


Edition: 5th
Author:
Read 2417 times
1 Reply

Related Topics

Replies
wrote...
#1
Valued Member
On Hiatus
9 years ago
The formula of moles is: moles=mass/atomic mass    or    n=m/Ma
Since m is constant, we see that, smaller atomic mass means more moles. Because of that, the atom with the smallest atomic mass has the most moles.
The atomic masses are (you can find these at a periodic table, like http://www.ptable.com/ )
Na -> 23
C -> 12
Pb -> 207.2
Cu -> 63.5
Ne -> 20.2
So, our answer should be C.

(alternatively, we can find the moles for all these atoms by replacing the m and Ma at the formula and then chose the atom with the most moles.)
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1102 People Browsing
 174 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 189
  
 913
  
 332
Your Opinion
Who will win the 2024 president election?
Votes: 10
Closes: November 4
Previous poll results: Where do you get your textbooks?