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Topic: Molality to Mole fraction problem  (Read 2580 times)

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Offline halcyoncxd

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Molality to Mole fraction problem
« on: December 15, 2012, 11:19:09 PM »
A solution of toluene (also called 1-methylbenzene) in benzene is prepared.  The mole fraction of toluene in the
solution is 0.100. What is the molality of the solution?

I tried working with 1 mol toulene. I got 1 mol toulene/9 mol h20. 1 mol toulene/0.162 kg = 6.2molal.
But the answer is wrong, where did I screw up?

Offline curiouscat

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Re: Molality to Mole fraction problem
« Reply #1 on: December 15, 2012, 11:29:45 PM »
But the answer is wrong, where did I screw up?

In mistaking Benzene for Water.

Offline halcyoncxd

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Re: Molality to Mole fraction problem
« Reply #2 on: December 15, 2012, 11:34:01 PM »
Yes but its asking for the molality which is moles solute /kg solvent. The solvent here is h2o i believe.

Offline curiouscat

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Re: Molality to Mole fraction problem
« Reply #3 on: December 15, 2012, 11:35:47 PM »
Yes but its asking for the molality which is moles solute /kg solvent. The solvent here is h2o i believe.

Why not Benzene as solvent?

Offline halcyoncxd

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Re: Molality to Mole fraction problem
« Reply #4 on: December 16, 2012, 12:23:49 AM »
O nm, understood thx.

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