![5. When 4.50 g of a substance are dissolved in 125 g of CCl, (M-153.8 g/mol), the freezing point of the solution is depressed by 3.9 K. KCCl) 30 and K,(CC4) 4.95 K kg mol 0.64 K] a) What is the boiling point elevation of the solution? b) By what fraction is the vapor pressure of the solvent reduced? 1](http://img.homeworklib.com/questions/f54f2100-609a-11eb-8643-8db71e0e509e.png?x-oss-process=image/resize,w_560)
Homework Answers
mass of the substance = 4.5g
depression in freezing point = i * kf * molality of the solution
3.9 = i * 30 * (4.5/153.8*1000/125)
i = vant hoff factor = 0.555
elevation in boiling point = i * kb * molality of the solution
(Tb - T0b) = i * Kb * m
Elevation in boiling point = 0.555*4.95*(4.5/153.8*1000/125)
Elevation in boiling point = 0.643 K
Add Answer to:
5. When 4.50 g of a substance are dissolved in 125 g of CCl, (M-153.8 g/mol),...
8) Dissolving 7.75 g of a substance into 825 g of benzene at 298 K raises...
8) Dissolving 7.75 g of a substance into 825 g of benzene at 298 K raises the boiling point by 0.575 K. Given that K, = 5.12 K kg mol-1 and K) = 2.53 K kg mol-1, calculate the freezing point depression, the molar mass of the solute, and the mole fraction of benzene in the solution.
3a. Calculate the molar mass (in g/mol) of an unknown 1:1 electrolyte if 0.482 g dissolved...
3a. Calculate the molar mass (in g/mol) of an unknown 1:1 electrolyte if 0.482 g dissolved in 223.1 mL of water at 74.75 °C has an osmotic pressure of 54.4 mmHg. R = 0.082058 L⋅atm⋅mol−1⋅K−1. 1.00 atm = 760 mmHg. Report your answer to THREE significant figures. 3b. Calculate the required mass of an unknown nonelectrolyte (ℳ = 131.5599 g/mol) dissolved in 140.1 g of solvent that gives a solution that boils at 36.04 °C. The boiling point of the...
Lysozyme extracted from chicken egg white has a molar mass of 13,930 g/mol. Exactly 0.1 g...
Lysozyme extracted from chicken egg white has a molar mass of 13,930 g/mol. Exactly 0.1 g of this protein is dissolved in 50 g of water at 298 K. Assuming that the protein is a nonelectrolyte, calculate the following: a. Vapor-pressure lowering (Pvap, H₂O = 23.76 mmHg at 298 K). b. Boiling-point elevation (Kb of H₂O=0.512 °C/m) c. Freezing-point depression (Kf of H₂O= 1.86 °C/m) d. Osmotic pressure
Calculate the mass of p-dichlorobenzene (mm=147.00 g/mol) that when dissolved in 125 ml cyclohexane (d=0.779 g/mol,...
Calculate the mass of p-dichlorobenzene (mm=147.00 g/mol) that when dissolved in 125 ml cyclohexane (d=0.779 g/mol, mm=84.16 g/mol) creates a solution with a boiling point of 81 degrees celcius. the kf of cyclohexane is 2.75 c/mol.
5. What mass of bacta (FW: 192.095 g/mol), a nonelectrolyte, must be dissolved in 5000.0 g...
5. What mass of bacta (FW: 192.095 g/mol), a nonelectrolyte, must be dissolved in 5000.0 g of ambori to give a solution with a freezing point of -1.50°C? What is that solution's boiling point? The normal boiling point of ambori is 84°C. The K of ambori is 39.7°C/m and the Ko of ambori is 2.34°C/m. (10 points)
5. If you had 0.10 m solutions of each of the solutions in question #4, which would have: (hint, more ions cause bigger colligative properties, few particles in solution | K" ("C/m) Pur...
5. If you had 0.10 m solutions of each of the solutions in question #4, which would have: (hint, more ions cause bigger colligative properties, few particles in solution | K" ("C/m) Pure Solvents Water Ethanol Benzene | Ke rc/m ) 0.512 1.19 2.65 1.86 1.99 -5.12 will have a smaller colligative affect.) d. the highest vapor pressure? e. the lowest freezing point? a. the highest boiling point? b. the highest freezing point? c. the lowest osmotic pressure? 6. Calculate...
QUESTION 4 If you take a 171 mL of a 1.4 M NaCl solution and dilute...
QUESTION 4
If you take a 171 mL of a 1.4 M NaCl solution and dilute it to
500 mL, what is the molarity of the final solution?
Enter the numerical answer in decimal notation
QUESTION 10
Information - Colligative
Properties
Colligative properties of solutions are those properties which
depend only on the number of dissolved solute particles in solution
not the chemical properties of the solute. For example when a
solute is dissolved in a solvent, vapor pressure
depression...
Pure benzene, C6H6, has a molar mass of 78.114 g mol-1, a density of 0.8765 g...
Pure benzene, C6H6, has a molar mass of 78.114 g mol-1, a density of 0.8765 g mL-1, a freezing point of 5.45°C, and a boiling point of 80.2°C. Its freezing point depression and boiling point elevation constants are: Kf = 5.07°C m-1; Kb = 2.53oC m-1. A solution was made by taking 33.88 g of an unknown nonelectrolyte and dissolving it in 175.0 g of benzene. The measured freezing point of the solution was 1.65oC. Calculate the molar mass of...
1.When a solution is made from 32.2 g of an unknown nonelectrolyte dissolved in 151 g...
1.When a solution is made from 32.2 g of an unknown nonelectrolyte dissolved in 151 g of solvent, the solution boils at 83.44 °C. The boiling point of the pure solvent and its Kb are 79.31 °C and 4.47 °C/m, respectively. Calculate the molar mass of the unknown electrolyte in g/mol. 2. Calculate the molar mass (in g/mol) of an unknown nonelectrolyte if 0.898 g dissolved in 268.7 mL of water at 30.13 °C has an osmotic pressure of 68.1...
A certain substance X has a normal boiling point of 116.6 °C and a molal boiling...
A certain substance X has a normal boiling point of 116.6 °C and a molal boiling point elevation constant K =2.07 C-kg-mol - Calculate the boiling point of a solution made of 24.8 g of urea *((NH2),Co) dissolved in 350. 5 of X Be sure your answer has the correct number of significant digits. 19 5 ? Save For Later Submit Assignment Check $ 5 6.
8) Dissolving 7.75 g of a substance into 825 g of benzene at 298 K raises the boiling point by 0.575 K. Given that K, = 5.12 K kg mol-1 and K) = 2.53 K kg mol-1, calculate the freezing point depression, the molar mass of the solute, and the mole fraction of benzene in the solution.
5. What mass of bacta (FW: 192.095 g/mol), a nonelectrolyte, must be dissolved in 5000.0 g of ambori to give a solution with a freezing point of -1.50°C? What is that solution's boiling point? The normal boiling point of ambori is 84°C. The K of ambori is 39.7°C/m and the Ko of ambori is 2.34°C/m. (10 points)
5. If you had 0.10 m solutions of each of the solutions in question #4, which would have: (hint, more ions cause bigger colligative properties, few particles in solution | K" ("C/m) Pure Solvents Water Ethanol Benzene | Ke rc/m ) 0.512 1.19 2.65 1.86 1.99 -5.12 will have a smaller colligative affect.) d. the highest vapor pressure? e. the lowest freezing point? a. the highest boiling point? b. the highest freezing point? c. the lowest osmotic pressure? 6. Calculate...
QUESTION 4
If you take a 171 mL of a 1.4 M NaCl solution and dilute it to
500 mL, what is the molarity of the final solution?
Enter the numerical answer in decimal notation
QUESTION 10
Information - Colligative
Properties
Colligative properties of solutions are those properties which
depend only on the number of dissolved solute particles in solution
not the chemical properties of the solute. For example when a
solute is dissolved in a solvent, vapor pressure
depression...
A certain substance X has a normal boiling point of 116.6 °C and a molal boiling point elevation constant K =2.07 C-kg-mol - Calculate the boiling point of a solution made of 24.8 g of urea *((NH2),Co) dissolved in 350. 5 of X Be sure your answer has the correct number of significant digits. 19 5 ? Save For Later Submit Assignment Check $ 5 6.
Most questions answered within 3 hours.
-
Say a study determines that the amount of time that college
students on a given campus...
asked 28 minutes ago -
Each PART should be 1–2 paragraphs in length.
PART 1: IDENTIFYING THE CUSTOMER AND PROBLEM
Choose...
asked 15 minutes ago -
A 0.357 g of sample of an unknown oxidant is added to an excess
solution of...
asked 29 minutes ago -
Bond James Bond Corporation has 7 percent coupon bonds that have
9 years left to maturity....
asked 24 minutes ago -
Suppose Rural wage = $2.40 per day, Urban modern wage = $4.50
per day, Urban informal...
asked 26 minutes ago -
Draw a different protonation states of histidine at pH 0, 4, 8,
12
asked 43 minutes ago -
List the four (4) elements of strategy Explain briefly those
activities that are conducted under each...
asked 46 minutes ago -
if
a smooth ball is 39.5mm and mass is 23g, the ball is released from
underwater....
asked 51 minutes ago -
An open economy whose total desired spending (C+I+G) exceeds its
potential output (Yf) experiences a trade...
asked 1 hour ago -
What are the differences between the leadership of virtual teams
and the leadership of traditional teams...
asked 1 hour ago -
A cotyledon is?
Group of answer choices
the zygote formed in ferns from the union of...
asked 1 hour ago -
Discuss creative strategy development and the roles of various
client and agency personnel.
asked 1 hour ago