31:25Molarity, Molality, Volume & Mass Percent, Mole Fraction & Density - Solution Concentration ProblemsThe Organic Chemistry Tutor399
08:02Molarity vs. molality | Lab values and concentrations | Health & Medicine | Khan Academykhanacademymedicine289
Multiple ChoiceA solution is prepared by dissolving 43.0 g potassium chlorate, KClO3, in enough water to make 100.0 mL of solution. If the density of the solution is 1.760 g/mL, what is the molality of KClO3 in the solution?7363Has a video solution.
Multiple ChoiceThe density of a 15.7 M methanol (CH3OH) solution is 0.858 g/mL. If H2O is the solvent, what is the molality of the solution?94923Has a video solution.
Multiple ChoiceWhat is the ionic molality of sodium ions in a solution of 25.7 g NaNO3 dissolved in enough water to make a 150.0 mL of solution? Density of the solution is 1.02 g/mL.44923Has a video solution.
Multiple ChoiceWhat is the molarity of a solution prepared by dissolving 5.00 g of NaCl in 500.0 mL of water?80
Textbook QuestionThe figure shows two identical volumetric flasks containing the same solution at two temperatures. (b) Does the molality of the solution change with the change in temperature? [Section 13.4] 178Has a video solution.
Textbook QuestionA solution is made containing 20.8 g of phenol 1C6H5OH2 in 425 g of ethanol 1CH3CH2OH2. Calculate (c) the molality of phenol.631Has a video solution.
Textbook QuestionAscorbic acid 1vitamin C, C6H8O62 is a water-soluble vitamin. A solution containing 80.5 g of ascorbic acid dissolved in 210 g of water has a density of 1.22 g>mL at 55 °C. Calculate (c) the molality,291Has a video solution.
Textbook QuestionThe density of acetonitrile 1CH3CN2 is 0.786 g>mL and the density of methanol 1CH3OH2 is 0.791 g>mL. A solution is made by dissolving 22.5 mL of CH3OH in 98.7 mL of CH3CN. (b) What is the molality of the solution?614Has a video solution.
Textbook QuestionThe density of toluene 1C7H82 is 0.867 g>mL, and the density of thiophene 1C4H4S2 is 1.065 g>mL. A solution is made by dissolving 8.10 g of thiophene in 250.0 mL of toluene. (b) Calculate the molality of thiophene in the solution.1063Has a video solution.
Textbook QuestionCalculate the number of moles of solute present in each of the following aqueous solutions: (b) 86.4 g of 0.180 m KCl,538Has a video solution.
Textbook QuestionAn aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate the molality of the solution. (Assume a density of 1.08 g>mL for the solution.)16061Has a video solution.
Textbook QuestionAn aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate the molality of the solution. (Assume a density of 1.05 g>mL for the solution.)1027Has a video solution.
Textbook QuestionDescribe how you would prepare each of the following aqueous solutions, starting with solid KBr: (b) 125 g of 0.180 m KBr,254Has a video solution.
Textbook QuestionBrass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 80.0 % Cu and 20.0 % Zn by mass has a density of 8750 kg>m3. (a) What is the molality of Zn in the solid solution?1107Has a video solution.
Textbook QuestionDescribe how to prepare each solution from the dry solute and the solvent. b. 125 g of 0.100 m NaNO31228Has a video solution.
Textbook QuestionA solution is prepared by dissolving 20.2 mL of methanol (CH3OH) in 100.0 mL of water at 25 °C. The final volume of the solution is 118 mL. The densities of methanol and water at this temperature are 0.782 g>mL and 1.00 g>mL, respectively. For this solution, calculate the concentration in each unit. b. molality686Has a video solution.
Textbook QuestionWhat is the molality of the 40.0 mass % ethylene glycol 1C2H6O22 solution used for automobile antifreeze?319Has a video solution.
Textbook QuestionEthylene glycol, C2H6O2, is a colorless liquid used as auto-mobile antifreeze. If the density at 20 °C of a 4.028 m solu- tion of ethylene glycol in water is 1.0241 g/mL, what is the molarity of the solution? The molar mass of ethylene glycol is 62.07 g/mol582Has a video solution.
Textbook QuestionNalorphine 1C19H21NO3 2, a relative of morphine, is used to combat withdrawal symptoms in narcotics users. How many grams of a 1.3 * 10-3 m aqueous solution of nalor-phine are needed to obtain a dose of 1.5 mg?188Has a video solution.
Textbook QuestionA 0.944 M solution of glucose, C6H12O6, in water has a density of 1.0624 g/mL at 20 °C. What is the concentration of this solution in the following units?(c) Molality458Has a video solution.
Textbook QuestionAcetonitrile 1CH3CN2 is a polar organic solvent that dissolves a wide range of solutes, including many salts. The density of a 1.80 M LiBr solution in acetonitrile is 0.826 g>cm3. Calculate the concentration of the solution in (a) molality,241Has a video solution.
Textbook QuestionFluorocarbons (compounds that contain both carbon and fluorine) were, until recently, used as refrigerants. The compounds listed in the following table are all gases at 25 °C, and their solubilities in water at 25 °C and 1 atm fluorocarbon pressure are given as mass percentages. (a) For each fluorocarbon, calculate the molality of a saturated solution. Fluorocarbon Solubility (mass %) CF4 0.0015 CClF3 0.009 CCl2F2 0.028 CHClF2 0.30224Has a video solution.
Textbook QuestionThere's actually much more in seawater than just dissolved NaCl. Major ions present include 19,000 ppm Cl-, 10,500 ppm Na+, 2650 ppm SO 2-, 1350 ppm Mg2+, 400 ppm Ca2+, 380 ppm K+, 140 ppm HCO3-, and 65 ppm Br-. (a) What is the total molality of all ions present in seawater?254Has a video solution.
Textbook QuestionAddition of 50.00 mL of 2.238 m H2SO4 1solution density = 1.1243 g>mL2 to 50.00 mL of 2.238 M BaCl2 gives a white precipitate. (b) If you filter the mixture and add more H2SO4 solution to the filtrate, would you obtain more precipitate? Explain.165Has a video solution.
