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נווט שעוד (d. Increase heat or add...
8. What is the final boiling point of a 1.25 molal solution of sugar in water?...
8. What is the final boiling point of a 1.25 molal solution of sugar in water? The Kb for water is 0.512 C/m. (For sugar i = l.) 9. A solution was prepared by dissolving 0.52 mol hexane into 400g CCl4. What is the change in freezing point of this solution? Carbon tetrachloride has a freezing point depression constant of 29.8 Cm,and freezes at-23。. 10. A solution was prepared by dissolving 0.26 moles of ethanol (C2HsOH) into 750g Diethyl ether....
4. An aqueous solution is 20.% glucose by mass (d = 1.078 g/mL at 20 °C)....
4. An aqueous solution is 20.% glucose by mass (d = 1.078 g/mL at 20 °C). Calculate the following: (Some useful constants for water: Kr = 1.86 °C/m and Ko = 0.512 °C/m) [-2.6°C] a) freezing point [100.71 °C] b) boiling point at 1 atm c) osmotic pressure (29 atm]
A solution at 30 ° C is prepared by dissolving 3 g of urea in 100...
A solution at 30 ° C is prepared by dissolving 3 g of urea in 100 ml of water. Under these conditions, calculate for the solution: a) the boiling point b) the freezing point c) the vapor pressure d) the osmotic pressure e) the ebulloscopic and cryoscopic constant (from the solvent data).
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...
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 2 A H-atom bonded to O atom (such as in water) can also form an...
QUESTION 2 A H-atom bonded to O atom (such as in water) can also form an intermolecular bond with which of the following atom(s): Select all that apply A. C B. N C. O D. F The boiling points of hydrides of group-6 is shown below. The general trend of increasing boiling point with increasing molecular weight can be observed for H2S, H2Se and H2Te. The boiling point of H2O is unusually high and is 100 Celsius, The reason for...
30. How many Tablespoons of table salt (NaCI) would you need to add to 2 quarts...
30. How many Tablespoons of table salt (NaCI) would you need to add to 2 quarts of water to increase the boiling point by 5°C? (1 Tablespoon NaCl = 17.06 g; 1 quart-0.946 L; d(H2O) 1.0 g/mL) (a) 17 (b) 32 (c) 79 (d) 540 31 . A covalent compound with molar mass of 62.0 g/mol was dissolved in water at 20.0°C to yield a 2.00 L solution with an osmotic pressure of 524 torr. What mass of the compound...
Which of the following is TRUE regarding dissolving a salt in water? a) The boiling point...
Which of the following is TRUE regarding dissolving a salt in water? a) The boiling point of the solution is lower than that of pure water. b) The freezing point of the solution is higher than that of pure water. c) The vapor pressure of a solution of NaCl will be higher than that of a solution of CaCl2. d) The osmotic pressure will increase as the molarity of the solution increases. e) All of these are true.
answer 1-4 Which of the following (a-d) is TRUE regarding solid NaCl dissolving in water The...
answer 1-4
Which of the following (a-d) is TRUE regarding solid NaCl dissolving in water The attraction of the water to the ions in NaCl is through dipole-dipole IFs. Water is considered the solute and NaCl the solvent. The partially positive oxygen in water is attracted to the chloride ion. d. The process of separating the sodium ions from the chloride ions is endothermic. All of these statements are true. polar For the following solution, describe the deviation with respect...
6. A 1.07 mg sample of a compound was dissolved in 78.1 mg of camphor. The...
6. A 1.07 mg sample of a compound was dissolved in 78.1 mg of camphor. The resulting solution melted at 176.0 C. What is the molecular mass of the compound? The melting point of pure camphor is 179.5 C. The freezing-point-depression constant for camphor Kf is 40.0 C/m. 7. A solution is prepared by dissolving 5.88 g of an unknown nonelectrolyte in enough water to make 0.355 L of solution. The osmotic pressure of the solution is 1.21 atm at...
8. What is the final boiling point of a 1.25 molal solution of sugar in water? The Kb for water is 0.512 C/m. (For sugar i = l.) 9. A solution was prepared by dissolving 0.52 mol hexane into 400g CCl4. What is the change in freezing point of this solution? Carbon tetrachloride has a freezing point depression constant of 29.8 Cm,and freezes at-23。. 10. A solution was prepared by dissolving 0.26 moles of ethanol (C2HsOH) into 750g Diethyl ether....
4. An aqueous solution is 20.% glucose by mass (d = 1.078 g/mL at 20 °C). Calculate the following: (Some useful constants for water: Kr = 1.86 °C/m and Ko = 0.512 °C/m) [-2.6°C] a) freezing point [100.71 °C] b) boiling point at 1 atm c) osmotic pressure (29 atm]
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...
30. How many Tablespoons of table salt (NaCI) would you need to add to 2 quarts of water to increase the boiling point by 5°C? (1 Tablespoon NaCl = 17.06 g; 1 quart-0.946 L; d(H2O) 1.0 g/mL) (a) 17 (b) 32 (c) 79 (d) 540 31 . A covalent compound with molar mass of 62.0 g/mol was dissolved in water at 20.0°C to yield a 2.00 L solution with an osmotic pressure of 524 torr. What mass of the compound...
answer 1-4
Which of the following (a-d) is TRUE regarding solid NaCl dissolving in water The attraction of the water to the ions in NaCl is through dipole-dipole IFs. Water is considered the solute and NaCl the solvent. The partially positive oxygen in water is attracted to the chloride ion. d. The process of separating the sodium ions from the chloride ions is endothermic. All of these statements are true. polar For the following solution, describe the deviation with respect...
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