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Topic: Molar volume in Water  (Read 14045 times)

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gio

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Molar volume in Water
« on: August 10, 2005, 12:26:40 AM »
Since I have to prepare an experiment to present in front of the class (laboratory) my teacher told me to do one about Molar Volume in Water.

So I decided to have water at 50ºC and 1 atm, and since I know the density of the water equal to 0.98804g/cm3 and k (kappa)= 4.4*10-10Pa-1.  And I want to prove which is the water's molar volume at those conditions :-\.  

I investigated that k (kappa) equals to 1/P (pressure).  Its hard to know, because I dont know if I assume that is an ideal gas

Thanks for the comments!

Offline Mitch

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Re:Molar volume in Water
« Reply #1 on: August 10, 2005, 12:31:46 AM »
I may be confused, but how is water an ideal gas?
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gio

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Re:Molar volume in Water
« Reply #2 on: August 10, 2005, 12:32:45 AM »
I think I'm wrong...Its not possible to be an ideal gas, indeed ;D

Offline Mitch

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Re:Molar volume in Water
« Reply #3 on: August 10, 2005, 12:34:21 AM »
That's what we are here for.

To ask you so many questions, that you figure things out yourself. :)
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gio

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Re:Molar volume in Water
« Reply #4 on: August 10, 2005, 12:37:21 AM »
But maybe i need someone to guide me on how to solve the question about the molar volume of water, i know that I should use the state equation and there is where k(kappa) appears as the isotermic compresibility, but I dont know how to put the density in that "state equation"

gio

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Re:Molar volume in Water
« Reply #5 on: August 10, 2005, 01:28:18 PM »
I think the liquid state of water at 50ºC.  And I think I dont have to count the dependence between k (kappa) with pressure.  I'll better rewrite the problem I have now :

Water at 50ºC and 1 atm, density=0.98804 g/cm3 and k(kappa= isotermic compresibility)=4.4x10-10 Pa-1.  
a) Which is the molar volume of the water at 50ºC and 1 atm.


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Re:Molar volume in Water
« Reply #6 on: August 10, 2005, 10:34:06 PM »
you don't need kappa. you are given the density of water.

since 1mole of water is 18g, what is the volume of 1mole of water?
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GCT

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Re:Molar volume in Water
« Reply #7 on: August 11, 2005, 06:29:25 PM »
I think the liquid state of water at 50ºC.  And I think I dont have to count the dependence between k (kappa) with pressure.  I'll better rewrite the problem I have now :

Water at 50ºC and 1 atm, density=0.98804 g/cm3 and k(kappa= isotermic compresibility)=4.4x10-10 Pa-1.  
a) Which is the molar volume of the water at 50ºC and 1 atm.

what exactly does your experiment/project consist of?  Is this a homework problem?  Try to make your intentions a bit more clear.

Another expression for k is (1/Vm)(RT/P^2)
« Last Edit: August 11, 2005, 06:29:59 PM by GCT »

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Re:Molar volume in Water
« Reply #8 on: August 13, 2005, 12:50:15 PM »
I have to prepare an experiment to present in front of the class (laboratory)
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Offline gregpawin

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Re:Molar volume in Water
« Reply #9 on: August 22, 2005, 04:49:37 AM »
perhaps you should do something other than to make water warm, especially in front of a easily distracted audience
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