The molality of solution = 1.576
Given
6.75% solution of ethanol in water
Required
The molality
Solution
Assume 100 g solution ,
Ethanol = 6.75 g⇒solute
Water = 93.25 g = 0.09325 kg⇒solvent
Molality = mol solute/kg solvent
mol Ethanol(MW=46 g/mol) :
[tex]\tt mol=\dfrac{6.75}{46}=0.147[/tex]
the molality :
[tex]\tt m=\dfrac{0.147}{0.09325}=1.576[/tex]
