General Chemistry II Chem1202 (6pts) Indicate the principal type of solute-solve

Question

General Chemistry II

Chem1202

(6pts) Indicate the principal type of solute-solvent interaction in each of the following solutions and rank the solutions from weakest to strongest solute-solvent interaction:

CaCl2 in water

CH2Cl2 in toluene (C7H8)

Methanol (CH3OH) in water

2) (2 pts) Common laboratory solvents include carbon tetrachloride (CCl4), ethanol (CH3CH2OH), benzene (C6H6) and xylene (C8H10). Which of these is the best solvent for polar solutes?

3) (5 pts) Calculate the vapor pressure of a solution of 44.0 g of glycerol (C3H8O3) in 500.0 g of water at 25°C. The vapor pressure of water at 25°C is 23.76 torr. (Assume ideal behavior). (Show work)

4) (10 pts) Ascorbic acid (vitamin C, C6H8O6) is a water soluble vitamin. A solution containing 80.5 g of ascorbic acid dissolved in 210 g of water has a density of 1.22 g/mL at 55°C. For ascorbic acid in this solution calculate (Show work)

A) the mass percentage

B) the mole fraction

C) the molality

D )the molarity

5) (5 pts) List the following solutions in order of decreasing freezing point: 0.040 m glycerin (C3H8O3), 0.020 m KBr, 0.030 m phenol (C6H5OH). (Show work)

6) (5 pts) Adrenaline is the hormone that triggers the release of extra glucose molecules in times of stress or emergency. A solution of 0.64 g of adrenaline in 36.0 g of CCl4 elevates the boiling point by 0.49°C. Is the molar mass of adrenaline calculated from boiling point elevation in agreement with that of its formula, C9H13NO3? The boiling point elevation constant for carbon tetrachloride can be found in your text. (Show work)

7) (5 pts) A 0.30 M solution of sucrose that is at 37°C has approximately the same osmotic pressure as blood does. What is the osmotic pressure of blood? (Show work)

Explanation / Answer

Ans 7- osmotic pressure is ;-

= iMRT

i = van 't Hoff factor of the solute
M = molar concentration in mol/L
R = universal gas constant = 0.08206 L·atm/mol·K
T = absolute temperature in K

i for sucrose is= 1

temprature is = 310K

molar concentration = mole / liter

= .30M/ 1 L

= .30 M/L

   = iMRT

= 1*.30*.08206*310

=7.63158 atm

The osmotic pressure of blood is 7.63158 atm

Related Questions

Navigate

• Browse (All)
• Browse G
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.