Posted by Anonymous on Sunday, November 11, 2012 at 1:37am.
100 mL alcohol has what mass?
mass = volume x density = 100 x0.78 = 780g or 0.780 kg.
mols 1.0 NaCl = 1.0/molar mass NaCl.
m = mols/kg solvent = ?
In order to calculate M you should know the density of the solution and you don't have that. I know the density of the alcohol is given but that isn't the density of the solution. To work the problem we must assume the volume of the soln is the same as the volume alcohol added. It won't be but it will be close.
Then M = mols NaCl/0.1L = ?
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