Homework Answers
1.A solution that contains 15.581 grams of benzene (molar mass = 78.1 g/mol) in 420 g...
1.A solution that contains 15.581 grams of benzene (molar mass = 78.1 g/mol) in 420 g of cyclohexane freezes at a temperature 9.50 ºC below the freezing point of pure cyclohexane. Calculate the molar freezing point depression constant, Kf, for cyclohexane. 2. The molar boiling point elevation constant for water is 0.512 ºC/m. What is the boiling point of a solution containing 673 g of water and 78.0 g of CaCl2? 3. A solution containing 32.0 g of an unknown...
3. The density of a 4.53 M NH, solution is 0.9651 g/mL Calculate the molality 4....
3. The density of a 4.53 M NH, solution is 0.9651 g/mL Calculate the molality 4. Calculate the freezing and boiling points of a solution made by mixing 10.5 g magnesium iodide with 150.0 g water. 5. A solution prepared by dissolving 0.56 g of a non-ionic solute in 25.0 g benzene freezes at 4.45°C. What is the molar mass of the solute?
Pure naphthalene freezes at 80.20 °C. Suppose that a student calculated K of naphthalene to be...
Pure naphthalene freezes at 80.20 °C. Suppose that a student calculated K of naphthalene to be 6.40 °C/m. Calculate the molar mass of an unknown if a solution containing 1.500 g of the unknown in 3.250 g of naphthalene froze at 70.50 °C. Show all your calculations on a separate sheet of paper, tak t oni chthalmare file here. To receive full credit, you must include calculation set-up, units, and significant figures.
8. 4.64 g of a nonelectrolyte is dissolved in 185.0 g naphthalene. The resulting solution freezes...
8. 4.64 g of a nonelectrolyte is dissolved in 185.0 g naphthalene. The resulting solution freezes at 78.7°C. Calculate the molar mass. FP naphthalene = 80.2°C; K = 6.90 °C kg/mol Answer A solution is prepared by dissolving 30.7 g ethylene glycol (.M 62.0) in 500.0 mL HO. What is the vapor pressure at 100.0°C? deo = 1.00 g/mL Answer
p-dichlorobenzene is an organic molecular (covalent) compound with i = 1 and Kf = 7.10 oC/m...
p-dichlorobenzene is an organic molecular (covalent) compound with i = 1 and Kf = 7.10 oC/m A student weighed 11.20 mL of p-dichlorobenzene and recorded mass of it as 10.820 g. The freezing point of the pure p-dichlorobenzene liquid was determined as 53.1 oC. 1.118 g of an unknown solid compound was added and completely dissolved in the previous sample of pure p-dichlorobenzene liquid. The freezing point determination procedure was conducted for the solution and the freezing point of this...
Pure toluene freezes at 41.9°C and has a freezing point depression constant of 5.1°C/m. The freezing...
Pure toluene freezes at 41.9°C and has a freezing point depression constant of 5.1°C/m. The freezing point of a solution containing 2.41 g of an unknown non-ionizing compound in 55.46 g of toluene is 38.1°C. What is the molar mass of the unknown compound? QUESTION 2 A solution of acetic acid, HC2H302, a weak monoprotic acid, was standardized by titration with 0.1660 M NaOH solution. If 20.59 mL of the NaOH were required to neutralize completely 18.23 mL of the...
i need help using the formula in the 3rd picture , to figure picture 2(the molar...
i need help using the formula in the 3rd picture , to figure
picture 2(the molar mass). I included needed information in picture
1
Pure TBA, T9 Ethylene Glycol/TBA Solution, T Calculation of Molar Mass of Ethylene Glycol Mass of ethylene glycol used (total amount in solution) .94 253 t Mass of TBA used Freezing point of pure TBA, T Freezing point of solution, T, oC oc oC Freezing point depression (total dgpression), 471 Total molal concentration m of ethylene...
U SR, test tube, apparatus, cyclohexane 2. Mass of flask, test tube, apparatus 3. Mass of...
U SR, test tube, apparatus, cyclohexane 2. Mass of flask, test tube, apparatus 3. Mass of cyclohexane 4. Freezing point, from cooling curve 203.239 g 7.9079 5.9°C B. Freezing Point of Cyclohexane plus Unknown Solute Unknown Solute Trial 1 Trial 2 Trial 3 1. Mass of cyclohexane 1.9029 8.152 8.40ly 2. Mass of solute, total Bolby 8.409 9.5989 3. Freezing point, (cooling curve) 1.8 C 2C 7°C 20° 7.9079 Calculations 1. K, for cyclohexane (pure solvent) 2. Freezing point change,...
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.
At what temperature in OC, will a 2.42msolution of ethanol in water freeze? Kfpwater=1.858OC/m Do NOT...
At what temperature in OC, will a 2.42msolution of ethanol in water freeze? Kfpwater=1.858OC/m Do NOT write units with your answer!!! If 11.57 of an unknown covalent compound is placed in 100.0mL of water. The solution boils at 101.182oC, what is the molar mass of the covalent compound in g/mol ? Kbpwater=0.512OC/m Density of water is 1.00g/mL. Do NOT write units with your answer!!! If 7.29 of an unknown covalent compound is placed in 100.0mL of water. The solution boils at...
3. The density of a 4.53 M NH, solution is 0.9651 g/mL Calculate the molality 4. Calculate the freezing and boiling points of a solution made by mixing 10.5 g magnesium iodide with 150.0 g water. 5. A solution prepared by dissolving 0.56 g of a non-ionic solute in 25.0 g benzene freezes at 4.45°C. What is the molar mass of the solute?
Pure naphthalene freezes at 80.20 °C. Suppose that a student calculated K of naphthalene to be 6.40 °C/m. Calculate the molar mass of an unknown if a solution containing 1.500 g of the unknown in 3.250 g of naphthalene froze at 70.50 °C. Show all your calculations on a separate sheet of paper, tak t oni chthalmare file here. To receive full credit, you must include calculation set-up, units, and significant figures.
8. 4.64 g of a nonelectrolyte is dissolved in 185.0 g naphthalene. The resulting solution freezes at 78.7°C. Calculate the molar mass. FP naphthalene = 80.2°C; K = 6.90 °C kg/mol Answer A solution is prepared by dissolving 30.7 g ethylene glycol (.M 62.0) in 500.0 mL HO. What is the vapor pressure at 100.0°C? deo = 1.00 g/mL Answer
Pure toluene freezes at 41.9°C and has a freezing point depression constant of 5.1°C/m. The freezing point of a solution containing 2.41 g of an unknown non-ionizing compound in 55.46 g of toluene is 38.1°C. What is the molar mass of the unknown compound? QUESTION 2 A solution of acetic acid, HC2H302, a weak monoprotic acid, was standardized by titration with 0.1660 M NaOH solution. If 20.59 mL of the NaOH were required to neutralize completely 18.23 mL of the...
i need help using the formula in the 3rd picture , to figure
picture 2(the molar mass). I included needed information in picture
1
Pure TBA, T9 Ethylene Glycol/TBA Solution, T Calculation of Molar Mass of Ethylene Glycol Mass of ethylene glycol used (total amount in solution) .94 253 t Mass of TBA used Freezing point of pure TBA, T Freezing point of solution, T, oC oc oC Freezing point depression (total dgpression), 471 Total molal concentration m of ethylene...
U SR, test tube, apparatus, cyclohexane 2. Mass of flask, test tube, apparatus 3. Mass of cyclohexane 4. Freezing point, from cooling curve 203.239 g 7.9079 5.9°C B. Freezing Point of Cyclohexane plus Unknown Solute Unknown Solute Trial 1 Trial 2 Trial 3 1. Mass of cyclohexane 1.9029 8.152 8.40ly 2. Mass of solute, total Bolby 8.409 9.5989 3. Freezing point, (cooling curve) 1.8 C 2C 7°C 20° 7.9079 Calculations 1. K, for cyclohexane (pure solvent) 2. Freezing point change,...
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.
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