Calculate the molality 6.75% solution of ethanol in water

Question

asked Jun 22, 2021 46.5k views

1 Answer

Mr Purple · Answer 1 · 2021-06-28T19:35:49+0000

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) :

$\tt mol=(6.75)/(46)=0.147$

the molality :

$\tt m=(0.147)/(0.09325)=1.576$