Why is the freezing point measurement of cyclohexane (and subsequent freezing point depression runs) started at ~10°C instead of room temperature? Explain.
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Why is the freezing point measurement of cyclohexane (and subsequent freezing point depression runs) started at...
You obtained the following graphical data from two experimental runs to determine the freezing point depression constant for a pure solvent. The solution was made up by adding 3.025 g of naphthalene, C10H8, to 45.320 g of pure solvent. 1.What is the freezing point temperature of the pure solvent (in oC)? 2.What is the solution freezing point temperature (in oC)? 3.What is the freezing point depression, Tfp (in oC)? 4.What is the molar mass of naphthalene (in g/mol)? 5.How many...
Molar Mass Determination by Freezing Point Depression Calculate and enter the freezing point depression of a solution of 57.6 g ethylene glycol (C2H602) in 734 g H20. Kffor H20 is 1.86 °C kg/mol. °C -2.53 1 homework pts Submit Answer Incorrect. Tries 3/5 Previous Tries A solution which contains 71.9 g of an unknown molecular compound in 363 g of water freezes at -3.85°C. What is the molar mass of the unknown? g/mol 1homework pts Submit Answer Tries 0/5 Molar...
A Molar Mass from freezing-point Depression. 1. Provide definitions for the following terms: a. Solution-cv b. Solute c. Solvent d. Colligative property e. Freezing-point depression a. What is the objective of this experiment? b. How will that objective be achieved? 3. A 0.2436-g sample of an unknown substances was dissolved in 20.0 mL of cyclohexane. The density of cyclohexane is 0.779 g/mL. The freezing-point depression was 2.5*C. Calculate the molar mass of the unknown substance. 4. What safety rules must...
a) Why does the temperature of pure cyclohexane remain constant during freezing? b) Why does the temperature of the solution during freezing not remain constant after the addition of solute to cyclohexane?
When 0.49 g of a molecular compound was dissolved in 20.00 g of cyclohexane, the freezing point of the solution was lowered by 3.9 degree C. Determine the molecular mass of this compound. The molar freezing point depression constant of cyclohexane 20.4 degree C/m. (K_f = 20.4 degree C/m)
colligative properties: freezing point depression. Gen chem 2 HINKI Acetic acid is known as a weak acid (electrolyte) when it is dissolved in water. A solution was prepared by dissolving acetic acid in cyclohexane to yield a concentration of 1.0 molukg. The freezing point depression of the solution was determined to be 13.2 °C. What is the van't Hoff factor for acetic acid dissolved in cyclohexane? Is acetic acid an electrolyte when it is dissolved in cyclohexane? Explain. Kre20 °C/m...
What is the expected freezing point depression and freezing point of a 0.20m solution of the strong electrolyte calcium chloride, CaCl2? Kf = 1.86°C/m
Molar Mass Determination by Freezing Point Depression Calculate and enter the freezing point depression of a solution of 65.1 g ethylene glycol (C2H602) in 792 g H20. Kffor H2O is 1.86 °C kg/mol. °C 1homework pts Submit Answer Tries 0/5 A solution which contains 60.9 g of an unknown molecular compound in 325 g of water freezes at -3.24°C. What is the molar mass of the unknown? g/mol 1homework pts Submit Answer Tries 0/5
CHM 112 Determination of Molar Mass by Freezing Point Depression Report Sheet and Data Analysis DATA TABLE Mass of lauric acid (g) 8.003 Mass of benzoic acid (g) 1.005 Freezing temperature of pure lauric acid (°C) 42.4 Freezing point of the benzoic acid-lauric acid mixture (°C) 38.7 Discuss possible sources of error in this experiment and how those errors would affect the final calculated molar mass. This is an open ended question and a thorough answer is expected. You should...
A. Freezing Point of Cyclohexane (Solvent 1. Mass of beaker, test tube (g) 2. Freezing point, from cooling curve 3. Instructor's approval of graph 33010 B. Freezing Point of Cyclohexane plus Unknown Solute Trial 1 Parts B.1, B.3) Unknown solute no. Trial 2 (Part B.4 Trial 3 Part B.5 1. Mass of beaker, test tube, cyclohexane (g) 2. Mass of cyclohexane (g) 3. Tared mass of added solute (g) 4. Freezing point, from cooling curve CC) 5. Instructor's approval of...