Question
An aqueous solution of ethanol is 14.1M C2H5OH. The density of the solution is 0.853g/mL. What is molality of ethanol in the solution? What is mass % of ethanol in solution?
I got the molality which is -21.7 ethanol, but I can't figure out how to get the mass % from the molality?
I got the molality which is -21.7 ethanol, but I can't figure out how to get the mass % from the molality?
Answers
molality = mols EtOH/kg solvent
Convert mols EtOH to grams. g = mols x molar mass.
Add g EtOH to 1000 for mass solution.
Then mass % = (grams EtOH/total grams)*100 = ?
By the way, I wonder how you obtained -21.7m. A negative number for concentration? I don't think so.
Convert mols EtOH to grams. g = mols x molar mass.
Add g EtOH to 1000 for mass solution.
Then mass % = (grams EtOH/total grams)*100 = ?
By the way, I wonder how you obtained -21.7m. A negative number for concentration? I don't think so.
Related Questions
The density of an aqueous solution containing 10% of ethanol (C2H5OH) by mass is 0.984 g/ml.
A) C...
A solution of ethanol (C2H5OH) is prepared by dissolving 35.0 ml of ethanol in enough water to make...
An ethanol-water solution is prepared by dissolving 10.00 ml ethanol C2H5OH (density=0.789g/ml) in s...
When 25 mL of C2H5OH (density 0.80 g.cm-3) is dissolved in water to prepare a 250 mL solution,
the...