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Author Topic: Mols?  (Read 6131 times)

Offline -shiNe!

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Mols?
« on: January 31, 2011, 08:12:28 PM »
For Chemistry, how do you find Moles?
We have to convert mols to grams for what we are doing right now, or grams to mols.

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Offline Lucky

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Re: Mols?
« Reply #1 on: January 31, 2011, 08:18:10 PM »
Ask Edi!  He explained it to me in like 2 minutes and I understood it better than a semester of studying it :P  Unfortunately, at the said time Edi was explaining it to me I was cramming for a mid-term, so I have forgotten it enough to the point I wouldn't feel comfortable explaining it :P


Offline TUR80

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Re: Mols?
« Reply #2 on: January 31, 2011, 08:37:08 PM »
um
moles
well you dig a mole out of the ground and weight it and convert the weight into grams

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Offline -shiNe!

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Re: Mols?
« Reply #3 on: January 31, 2011, 08:56:45 PM »
Unfortunatly I have no Idea who Edi Is

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Offline BFM_SirTaco

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Re: Mols?
« Reply #4 on: January 31, 2011, 09:29:19 PM »
hey there

so here is a quick run down

a mole (shortened to mol by some chestry teachers) is a unit of measurement.  Now a mole is not a weight or a unit of length, rauther a mole is a set number.  the value of a mole ir roughly 6.022 x 1023

this number is based on the number of ATOMS (please note that atoms are a COUNTED value) in 12.000 grams of carbon.  This is called Avogadro's constant or number.  So for instance if we were to count the number of atoms in 12.000 grams of carbon we would come up with roughly 6.022 x 1023.  I hope you are following me so far.

now if you look at your periodic table you will see the symbol for all the elements.   if you find carbon, under it you will find the number 12.000.  Now this value has been disputed and will sometimes say 12.011 or something very close so check with your chemistry book before continuing.  This number and all the numbers directly underneath their their respective element symbols represent how many GRAMS of an element there are when ONE MOLE of particles of the element are weighed.

lets try an example:

you teacher asks: how many grams of Magnesium will i have if i have 2.35 mols of magnesium.

first you would find magnesium on your periodic table and see that there are 24.305 grams of magnesium for every mol and then you would simply multiply 2.35 mols by 24.305 g and end up with 54.7 grams of Magnesium (notice i used my significant digits or figures to round my final answer).

similarily it works the same way around: you get the question, "i have 500. g of lead how many mols of lead do i have?" and you would divide 500. g of lead by 207.2g lead (which is the number of grams of lead in one mole of lead) and get 2.41 mols of lead (notice i again used my significant digits or figures to round my final answer)

any questions feel free to post....

alternatively you could watch this catchy video with a song that will get stuck in your head and you will never forget what a mole is

http://www.youtube.com/embed/1R7NiIum2TI
« Last Edit: January 31, 2011, 09:34:17 PM by BFM_SirTaco »

Offline BFM_Zakk

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Re: Mols?
« Reply #5 on: January 31, 2011, 09:31:14 PM »




Offline BFM_SirTaco

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Re: Mols?
« Reply #6 on: January 31, 2011, 09:39:11 PM »
i think i explained sufficiently.. maybe not in the simplest terms but i hope it helps

Offline MufnMan

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Re: Mols?
« Reply #7 on: January 31, 2011, 09:45:04 PM »
Very Nice Sir! I learned about them earlier this year and my brain hurt when we were finished... :LOL:




54.77    62.93    46.97    77.27    68.80    55.83    99.93    89.77


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Offline -shiNe!

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Re: Mols?
« Reply #8 on: January 31, 2011, 09:50:10 PM »
I hope you are following me so far.

I was perfectly fine till I saw your avatar  :eek: So I had re-read It a few times
 :XD:
Helped a lot, you explained It very well. Thanks!  :yesyes:

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I am only happy that I got to experience such a legendary clan.

Offline BFM_SirTaco

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Re: Mols?
« Reply #9 on: January 31, 2011, 10:53:29 PM »
haha good glad i could help

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Offline BFM_SüprM@ñ

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Re: Mols?
« Reply #10 on: March 13, 2011, 11:19:40 AM »
Nice video. = )
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