The freezing point depression constant (Kf) of acetic acid is 3.90 \deg Ckg/mol. Using this value and the freezing point data (remember that what we care about is the difference in freezing point!) calculate the molality of the 2nd trial.
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- When 2.43 g of a certain molecular compound X are dissolved in 65. g of formamide (NH₂COH), the freezing point of the solution is measured to be -0.4 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to 2 significant digits.What is the freezing point of a solution containing 3.10 grams benzene (molar mass = 78.11 g mol-1) dissolved in 32.0 grams of paradichlorobenzene (molar mass = 147.0 g mol-1)? The freezing point of pure paradichlorobenzene is 53.0 °C, and the freezing point depression constant is 7.10 K kg mol-1.A geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 43.33 g L.. The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 3.1 g.1.¹. Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated. Round each of your answers to 2 significant digits. 0% 0.8 X 5
- COLLIGATIVE PROPERTIES: SMART WORKSHEET PART I. DETERMINING THE FREEZING POINT OF WATER PART 1.1 The expression for the freezing point depression of a solution relative to that of the pure solute is shown by the following equation: ATƒ = i × Kƒ × m From solutions of known concentrations of sodium chloride in water, you determine Kƒ, the freezing point depression constant of water. What assumption is necessary in order to do these calculations? Necessary assumption for these calculations i=1 A2. You have a solution that contains 4.0g of oxalic acid dissolved in 100 mL of water. This solution is placed in a separatory funnel, and then 100 mL of diethyl ether is added to the separatory funnel and an extraction is performed. (Diethyl ether and water are immiscible solvents.) Use the following constants to calculate how much oxalic acid is in each solvent after the extraction. Solubility of oxalic acid in water = 9.5 g / 100 mL Solubility of oxalic acid in ether = 16.9 g/100 mLCalculate the values for log Kow and the saturated aqueous solubility (Cw$sat) for bisphenol A. The value for log Kow is 3.62 ; enter your answer as X.XX The value for Cwsat is ; report your answer in units of moles/liter and enter it as X.XX×10(-X). Bisphenol A is closest to "phthalates" H3C CH3 HO HO,
- A CHM 126 student followed a modified procedure similar to the one described in the "Determination of Molar Mass by Freezing Point Depression" experiment. The student's data is listed below. Using the data, determine the molar mass of the solute. freezing point depression constant for solvent = 8.1186 °C/m mass of solvent = 4.8810 g mass of solute 0.2100 g !! freezing point of pure solvent 24.231 °C freezing point of solution = 21.571°C Type your answer in the space below without the units.When 4.92 g of a certain molecular compound X are dissolved in 30. g of formamide (NH,COH), the freezing point of the solution is measured to be 1.7 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to 1 significant digit. x10When 5.31 g of a certain molecular compound X are dissolved in 70. g of formamide (NH,COH ), the freezing point of the solution is measured to be 1.9 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits. 미미
- synthetic ion exchange resins. These resins are organic polymeric networks that contain functional groups that are permanently attached to the resin. One such functional group is sulfonic acid, -SO3H. When placed in water, the resin (being a large organic molecule) will not dissolve. However, the ionic functional groups become hydrated and the resin will swell as it takes up waters of hydration. The resin may then be thought of as a solid solution mixture with the functional groups being "dissolved" but the polymer remaining as a solid. The hydronium ion (H3O+) associated with acidic functional groups like sulfonic acid will dissociate just as it would if the acid were free of the resin. If other cations such as Cu2+ or Na+ are added to the resin, an ion-exchange reaction can occur: . Note that one H+ is released for each positive charge bound to the resin. Since the resin exchanges a hydrogen ion for a sodium ion in this reaction, sulfonic acid resins are called cation-exchange…In class we are learning about solubility, electrolytes both strong and weak. I totally get it. I just want to review how the notation of polar covalent soluble nonelectrolytes work. For example, Glucose as a solid being dropped in a water solution. Even though it is not ionic, it is very soluble and does not break up, so is not a electrolyte. Like an Ionic soluble, it does get hydrated. Thus , by thjs logic should it be notated like this? Glucose (s) >>>>>>>> Glucose (aq) ??? Or is there some other notation for sugar solution?Heat of Reaction, Mole Fraction 1. A group of students perform a series of experiments mixing HCI with an unknown base of the formula M(OH)n. For each trial the total volume of acid and base was 50.0 mL. The concentration of the acid and base solutions were 0.6000 M. The data is plotted in the graph provided. The density of the aqueous solution is assumed to be 1.00 g/mL and the specific heat of water is 4.18 J/g °C in joules 1600 1400 1200 1000 800 600 400 200 0 0.0000 0.6000 M HCI 0 2000 0.6000 M(OH)x 0 4000 0 6000 Mole Fraction of Acid 0 8000 10000 a) What is the limiting reagent at a mole fraction of 0.6 of acid? b) Write a balanced equation for the reaction of M(OH), with HCI. (You must determine "n") c) For one trial, the students measured a temperature change of + 2.9 °C. Calculate q. d) The students calculated a value of q of 1.5 x 10³ J for one of their trials. For this trial 0.015 mol of HCI and 0.015 mol of M(OH), were used. Calculate heat per mole for this reaction.