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Old Mar 10, 2008, 02:41 AM // 02:41   #1
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Default Warning - This involves thinking. Chemistry Molarity Problem.
I told you ahead of time this would involve thinking, so no crying please.

Determine the molarity of the saturated KNO3 solution at 25 Celcius.

I used a graph to determine that 40 grams of KNO3 can dissolve in 100 grams water at 25 Celcius.

40 Grams * 1 Mol
------------------------- ------ = 0.396 Moles --> 0.4 Moles (Sig Figs)
101 Grams

Moles Solute
--------------------- = Molarity
Liters Solvent

X = 0.4
-----
Y

The problem is I can't use the molarity equation because the solvent is in grams, not liters. I could determine the molality, but there is no way to change molality to molarity. I know of no way to change grams to liters.
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Old Mar 10, 2008, 02:51 AM // 02:51   #2
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Well grams is weight and liters is volume so...you'd have to find out how many liters per gram, or how many grams per liter...?
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Old Mar 10, 2008, 03:16 AM // 03:16   #3
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I think the conversion factor for water at standard temperature is 1000g = 1L
100g x 1L/1000g = .1L
M= Moles/L = .4 moles/.1 L
4M I think...
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Old Mar 10, 2008, 03:43 AM // 03:43   #4
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mah brain esploeds
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Old Mar 10, 2008, 05:40 AM // 05:40   #5
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This is the reason Chemistry sucks and Chem Eng is the way to go^^.
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Old Mar 10, 2008, 12:33 PM // 12:33   #6
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I probably could solve this problem if I tried...but I recently shut off my brain permanently so I can't remember enough to.....where am I again?
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Old Mar 10, 2008, 01:25 PM // 13:25   #7
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Why do children keep coming here with their homework problems?

I will amuse you this time:

Mass=density/volume

Problem solved seeing as the density of water is defined as 1.0 making 100grams of water 100ml exactly.
Following it through gives you a molarity of 3.96M

Also Chem eng is totally stupid. Chemistry is waaaayyyy better!!! Lots of lovely quantum mechanics and pertubation theory!
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Old Mar 10, 2008, 09:02 PM // 21:02   #8
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Quote:
Originally Posted by poobert
Mass=density/volume
No it's not. mass is the product of density and volume.
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Old Mar 10, 2008, 09:10 PM // 21:10   #9
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Turn liters into dm3. That is all.
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Old Mar 10, 2008, 09:11 PM // 21:11   #10
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Quote:
Originally Posted by Lasareth
No it's not. mass is the product of density and volume.
yup thats it. My bad
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Old Mar 10, 2008, 11:37 PM // 23:37   #11
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Quote:
Originally Posted by poobert
Also Chem eng is totally stupid. Chemistry is waaaayyyy better!!! Lots of lovely quantum mechanics and pertubation theory!
who cares about quantum mechanics. When you get to do fun things like thermodynamics, fluid mechanics and separation processes
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Old Mar 10, 2008, 11:39 PM // 23:39   #12
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Just fyi guys

http://guildwarsguru.com/forum/showt...php?t=10263391

He posted a similar thread last week and returned, but he hasn't seemed to have returned yet to look at this, or even post a thank you. Just an fyi.


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Old Mar 11, 2008, 12:17 AM // 00:17   #13
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I vote we do not help this person out anymore...*though I didn't really help to begin with*
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Old Mar 11, 2008, 12:56 AM // 00:56   #14
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yeah wasnt his last science thread toasted???

please find a real science forum and leave us poor gurus alone!
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Old Mar 11, 2008, 02:03 AM // 02:03   #15
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/reported for this continueous spam of a troll ><



.........../\ ...... / I'm...)
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Old Mar 11, 2008, 02:06 AM // 02:06   #16
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1L = 1 kg ? then again I may be wrong, I'm a little tired of chemistry... And this time reply to the thread...
Last edited by RedStar; Mar 11, 2008 at 02:12 AM // 02:12..
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Old Mar 11, 2008, 04:05 AM // 04:05   #17
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That is correct in the case of water RedStar.

Quote:
Originally Posted by poobert
Why do children keep coming here with their homework problems?
It's just him.
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Old Mar 11, 2008, 04:25 AM // 04:25   #18
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That's what I though , but it was to be sure.

Quote:
Determine the molarity of the saturated KNO3 solution at 25 Celcius.I used a graph to determine that 40 grams of KNO3 can dissolve in 100 grams water at 25 Celcius.
I just noticed that xD, so that means that it's 0.1L right ?

And it seems that Clamchowder already answered the guy xD.
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Old Mar 11, 2008, 10:19 AM // 10:19   #19
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Quote:
Originally Posted by I D E L E T E D I
who cares about quantum mechanics. When you get to do fun things like thermodynamics, fluid mechanics and separation processes
I will give you fluid mechanics and separation processes, but chemistry has statistical thermodynamics, which is better than the regular stuff. And lets be honest, except for wind tunnels and gyroscopes, engineering labs pail in comparison to chem labs.

*also i suppose i shouldn't have answered considering this thread is about to be locked.
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Old Mar 11, 2008, 10:38 AM // 10:38   #20
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Biology is just Chemistry, Chemistry is just Physics, Physics is just Maths.



Maths are just Boring.
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