Question

Overall question: What is the molality of

a 3.25 M aqueous solution of ethanol,
C2H5OH?
From previous steps, you know:
Moles of ethanol = 3.25 moles
Mass of solvent = 828 g
m = [?]
mol C₂H5OH
kg H₂O
Molality (mol/kg)
Enter

Answer 1

Explanation: Molar mass of ethanol = 46g/mole.

Moles of ethanol= 3.25 moles

Molality = moles of ethanol/ Mass of solvent in kg

Mass in kg = 828/1000kg=0.828

Molality= 3.25×0.828 Mol per kg

Molality=3.92 Mole/kg

m= mass of ethanol

moles= mass/molar mass

mass= moles ×molar mass

mass= 3.25×46= 149.5 gram