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Topic: Find Mole-Fraction  (Read 1874 times)

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Offline niall-mac

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Find Mole-Fraction
« on: May 04, 2012, 11:12:03 AM »
I am struggling with this question if anyone could help out it would be much appreciated.

Calculate the mole-fraction concentration of NaCL in a solution containing 0.5 mole/l of NaCl. Taking the density of the solution as 1020kg/m^3.

Cheers
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Offline sjb

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Re: Find Mole-Fraction
« Reply #1 on: May 04, 2012, 11:20:20 AM »
Quote from: niall-mac on May 04, 2012, 11:12:03 AM
I am struggling with this question if anyone could help out it would be much appreciated.

Calculate the mole-fraction concentration of NaCL in a solution containing 0.5 mole/l of NaCl. Taking the density of the solution as 1020kg/m^3.

Cheers

Start by imagining you have, say 1 litre of solution. What is the mass of this? What is the mass of salt, and hence solvent. How many moles of salt, and of solvent do you have?
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Offline niall-mac

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Re: Find Mole-Fraction
« Reply #2 on: May 04, 2012, 11:56:55 AM »
I would imagaine the weight of the solution is 29.25 since one mole is 58.5 then 0.5 mole per l is half this. Then generally have a mental block after this. Chemistry is just not my subject.

Could you perhaps elaborate a bit further to help me out.

Thanks
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