November 16, 2024, 05:22:53 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Find Mole-Fraction  (Read 1970 times)

0 Members and 1 Guest are viewing this topic.

Offline niall-mac

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
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
Logged

Offline sjb

  • Global Moderator
  • Sr. Member
  • ***
  • Posts: 3653
  • Mole Snacks: +222/-42
  • Gender: Male
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?
Logged

Offline niall-mac

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
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
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links