Posted by **nancy** on Tuesday, March 20, 2007 at 9:26pm.

I have a 0.25 m aquaeous solution of HCL. It's density is 1.05 g/ml. WHat is the % by mass (m/m) of this solution? What is the molarity of the solution?

define molality.

m = # mols/kg solvent.

We have 0.25 m so we must have 0.25 x 36.5 g/mol HCl = 9.125 g HCl/1000 g solvent. The total mass of the solution, then, is 1000 g solvent + 9.125 g HCl = 1009.125 g.

percent by mass = [9.125/1009.125]x100 = ?? and round to the appropriate number of places.

Molarity = # mols/liter of solution.

mass of 1 L of solution = 1.05 g/mL x 1000 mL = 1050 grams.

How much of that is HCl?

1050 g x (%/100) = grams HCl.

grams HCl/molar mass HCl = mols HCl/L which is Molarity.

Check my thinking. Check my numbers carefully.

## Answer This Question

## Related Questions

- AP Chemistry - 1. The heat of solution of salta may either be endothermic or ...
- Chemistry - Calculate the freezing point depression and osmotic pressure at 25 ...
- Chemistry - A solution contains 0.0653g of compound in 8.31g of ethanol. The ...
- chem - how do u set up with problem How would you prepare 165 mL of a 0.0317 m ...
- Chemistry - A teacher prepares a saturated NaCli solution at 55 Degree C. What ...
- chemistry - A solution of HCI has a density of 1.18 g/ml and is 36% (m/m). what...
- chemistry urg! - Hydrochloric acid is sold as a concentrated acqueous solution. ...
- "Given Molality, calculate..." - "Given: An aqueous solution of C6H12O6 with a ...
- Chemistry - An aqueous solution is 8.50% ammonium chloride, NH4Cl, by mass. The ...
- chemistry - A commercial sample of concentrated aqueous nitric acid (HNO3) is 18...

More Related Questions