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Water

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Water's Noob Chem Question
« on: March 20, 2011, 08:43:03 pm »
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If 1 atom of 12 C has an atomic mass of 12 exactly.


1 mol of atoms has 12C has a mass of 12gram exactly.



How do you do the mathematics behind this? Just now , looking back, now I"m questioning Lol.

How do we get the mass of 1 atom?

« Last Edit: March 20, 2011, 08:46:29 pm by Water »
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About Philosophy

When I see a youth thus engaged,葉he study appears to me to be in character, and becoming a man of liberal education, and him who neglects philosophy I regard as an inferior man, who will never aspire to anything great or noble. But if I see him continuing the study in later life, and not leaving off, I should like to beat him - Callicle

jasoN-

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Re: Water's Noob Chem Question
« Reply #1 on: March 20, 2011, 08:45:46 pm »
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n = m / mr
m = n + mr = 1 x 12 = 12g

is that the math ur looking for? or..
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Water

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Re: Water's Noob Chem Question
« Reply #2 on: March 20, 2011, 08:47:09 pm »
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Looking,



If 1 mol of C12 = 12 grams



Then 1 Atom of C12 = What's the mass?
                            - Using mathematics



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nacho

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Re: Water's Noob Chem Question
« Reply #3 on: March 20, 2011, 08:48:46 pm »
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12/6.02 x 10^23 grams

edit: sorry, typo.
« Last Edit: March 20, 2011, 08:52:41 pm by nacho »
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jasoN-

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Re: Water's Noob Chem Question
« Reply #4 on: March 20, 2011, 08:50:34 pm »
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1 atom of C12 has an atomic mass of 12

1 atom of C12 has a mass of 12 / (6.02 x 10^23) grams
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Water

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Re: Water's Noob Chem Question
« Reply #5 on: March 20, 2011, 08:51:20 pm »
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Jason, thats what I thought, but it isn't right. If its atomic mass is 12? I"m under the definition that atomic mass= 1 atom.
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When I see a youth thus engaged,葉he study appears to me to be in character, and becoming a man of liberal education, and him who neglects philosophy I regard as an inferior man, who will never aspire to anything great or noble. But if I see him continuing the study in later life, and not leaving off, I should like to beat him - Callicle

iNerd

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Re: Water's Noob Chem Question
« Reply #6 on: March 20, 2011, 08:53:11 pm »
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I'm lost?

The RAM of Carbon is 12.

n = m/M

1=m/12

m = 12g

EDIT: INCORRECT
« Last Edit: March 20, 2011, 08:55:50 pm by ATAR »
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jasoN-

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Re: Water's Noob Chem Question
« Reply #7 on: March 20, 2011, 08:53:48 pm »
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atomic mass = molar mass
molar mass = grams per mol

so 12 grams per mol makes sense.
1 mol of carbon atoms is 6.02 x 10^23 carbon atoms, or 12 grams worth
its just a different way to say the same shit
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nacho

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Re: Water's Noob Chem Question
« Reply #8 on: March 20, 2011, 08:54:13 pm »
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Quote from: ATAR on March 20, 2011, 08:53:11 pm
I'm lost?

The RAM of Carbon is 12.

n = m/M

1=m/12

m = 12g
n = mol = 6.02 x 10^23 atoms, not 1 atom
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Re: Water's Noob Chem Question
« Reply #9 on: March 20, 2011, 08:55:25 pm »
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Quote from: nacho on March 20, 2011, 08:54:13 pm
Quote from: ATAR on March 20, 2011, 08:53:11 pm
I'm lost?

The RAM of Carbon is 12.

n = m/M

1=m/12

m = 12g
n = mol = 6.02 x 10^23 atoms, not 1 atom
Oh shit. My bad.
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Water

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Re: Water's Noob Chem Question
« Reply #10 on: March 20, 2011, 08:57:26 pm »
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12/ 6.02 x 10^23 = 2 x 10^-23


How does that correspond to the  atomic mass of Carbon?


Or is there no relation, whatsoever? ...
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Re: Water's Noob Chem Question
« Reply #11 on: March 20, 2011, 08:58:28 pm »
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It doesn't - the atomic mass of an atom is how much 1 mol of the atom would weigh.
So 1 atom of 12C is gonna be 2 x 10^-23, but 1 mol of those atoms would be 12g
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iNerd

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Re: Water's Noob Chem Question
« Reply #12 on: March 20, 2011, 08:59:07 pm »
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Quote from: chriszorr on March 20, 2011, 08:58:28 pm
It doesn't - the atomic mass of an atom is how much 1 mol of the atom would weigh.
So 1 atom of 12C is gonna be 2 x 10^-23, but 1 mol of those atoms would be 12g
This is correct.

http://chemistry.about.com/od/workedchemistryproblems/a/avogadroexampl1.htm

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jasoN-

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Re: Water's Noob Chem Question
« Reply #13 on: March 20, 2011, 09:00:00 pm »
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each carbon atom weighs ~2 x 10^-23 grams

remember atomic mass is grams per mol
so atomic mass of carbon is 2 x 10^-23 grams per mol of carbon
in this case 1 mol of carbon is 2 x 10^-23 x 6.02 x 10^23, or 12 grams
like i said ur just going round and round the same concept
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Water

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Re: Water's Noob Chem Question
« Reply #14 on: March 20, 2011, 09:06:04 pm »
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 I UNDERSTAND NOW. God, >_<! I feel so noob.

« Last Edit: March 20, 2011, 09:58:02 pm by Water »
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About Philosophy

When I see a youth thus engaged,葉he study appears to me to be in character, and becoming a man of liberal education, and him who neglects philosophy I regard as an inferior man, who will never aspire to anything great or noble. But if I see him continuing the study in later life, and not leaving off, I should like to beat him - Callicle
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