Chem Problem Set

13.30
a)What is the molality of a solution formed by dissolving 1.50 mol of KCL in 16.0 mol of H2O?

13.32
Ascorbic Acid(Vitamin C - C6H8O6) is a water-soluble vitamin. A solution containing 80.5g of ascorbic acid issolved in 210g of H2O and has a density of 1.22g/mL at 55`C.
Calculate:
a. mass percentage.
b. mole fraction
c.molality
d. molarity of ascorbic acid in the solution..

13.34
The density of toluene(C7H8) is 0.867g/mL, and the density of thiophene(C4H4S) is 1.065g/mL. A solution is made by dissolving 10.0g of thiophene in 250.0mL of toluene.
a. Calculate the mole fraction of thiophene.
b. Calculate the molality of thiophene.
c. Assuming that the values of the solute and solvent are additive, what is the molarity of thiophene in the solution?

13.36
Calculate the number of moles of solute present in each of the ff. sol'ns.
a. 245 mL of 1.59M HNO3(aq).
b. 50.0 mg of an aqueous solution that is 1.25m NaCl.
c. 75.0g of an aqueous solution that is 1.50% sucrose(C12H22O11) by mass.

Courtesy of Cs 2013 blog.