Posted by
Message
Member since Jan 2011
3939 posts

How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
Have all my HW correct but this one. Not asking for an answer but can someone walk me through it.

SprintFun
Ohio State Fan
Columbus, OH
Member since Dec 2007
43928 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
6

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theunknownknight
LSU Fan
Baton Rouge
Member since Sep 2005
36660 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
you gotta count them

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Spirit of Dunson
Columbia Fan
Member since Mar 2007
22642 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
for real?
convert grams to moles. moles to molecules.
Please tell me this isn't college.

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UNO Fan
Warsawa/ATL
Member since Jul 2007
10497 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
(1 amu = 1.6605 10-24 g)

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Dumplin
LSU Fan
New Orleans, LA
Member since Sep 2008
1343 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
Use the molecular weight of copper to determine how many moles constitutes 2.15g. There will be Avagadro's number of atoms in a mole of copper.

Spirit of Dunson
Columbia Fan
Member since Mar 2007
22642 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =

Member since Jan 2011
3939 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
This would be chem 1201. Hate it. Thanks for the help.

Rouge
USA Fan
TD.com HOF Member - Class of 2014
Member since Oct 2004
111314 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
1 gram = 6.0221415E23 atomic mass units

Atomic Mass of copper: 63.546 amu

(6.0221415E23 * 2.15) / 63.546

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Gaston
LSU Fan
Dirty Coast
Member since Aug 2008
25266 posts
Online

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
Industrial Engineering, and a sophomore?

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Member since 2001
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littlePNdaB
LSU Fan
Baton Rouge
Member since May 2010
687 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
2.15g x 1mol/53.546g x 6.022x10^23/1mol = 2.42x10^22 molecules of Cu

Gaston
LSU Fan
Dirty Coast
Member since Aug 2008
25266 posts
Online

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
quote:

This would be chem 1201. Hate it.

You ever thought of a marketing major?

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WhiteWhale
LSU Fan
LSU Fan, Auburn Hater
Member since Aug 2009
6546 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
quote:

The frick?

How cant you do this? You asked a different easy question recently.

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Tbobby
USA Fan
Member since Dec 2006
3935 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
There are 6.02 x 10 X 23 moles in a avacado.

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Spirit of Dunson
Columbia Fan
Member since Mar 2007
22642 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
quote:

2.15g x 1mol/53.546g
where did you get this number?

Rouge
USA Fan
TD.com HOF Member - Class of 2014
Member since Oct 2004
111314 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
quote:

53.546g

where did you get this number?
typo

honest mistake, i'm sure

Member since Jan 2011
3939 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
This is the first question I have asked. For all non chem engineers you only have to take 2 chems.

Rouge
USA Fan
TD.com HOF Member - Class of 2014
Member since Oct 2004
111314 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
quote:

go into indoor air quality

thank me later

work towards being Certified Industrial Hygienist

Spirit of Dunson
Columbia Fan
Member since Mar 2007
22642 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
quote:

typo

honest mistake, i'm sure
i just wanted to give him shite. I was about to make a manganese isotope joke.
This post was edited on 1/27 at 4:01 pm

Tbobby
USA Fan
Member since Dec 2006
3935 posts

re: How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu =
quote:

Certified Industrial Hygienist

Telling men they have to shave their goatees.

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