14. Solutions

Molality

14. Solutions

Molality

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05:23

What's the Point of Molality?!?

Molarity, Molality, Volume & Mass Percent, Mole Fraction & Density - Solution Concentration Problems

The Organic Chemistry Tutor

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06:53

How to Calculate Molality

Molarity vs. molality | Lab values and concentrations | Health & Medicine | Khan Academy

What's the Difference Between Molarity and Molality?

Molality and Colligative Properties

Professor Dave Explains

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Water & Solutions - for Dirty Laundry: Crash Course Chemistry #7

13:34

Water & Solutions - for Dirty Laundry: Crash Course Chemistry #7

CrashCourse

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Practice this topic

Multiple Choice

A 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?

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Multiple Choice

The 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?

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Multiple Choice

What 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.

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Multiple Choice

What is the molarity of a solution prepared by dissolving 5.00 g of NaCl in 500.0 mL of water?

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Multiple Choice

Calculate the molality of an aqueous solution that is 48.0% by mass Ca(NO₃)₂.

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Textbook Question

The 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]

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Textbook Question

A solution is made containing 20.8 g of phenol 1C6H5OH2 in 425 g of ethanol 1CH3CH2OH2. Calculate (c) the molality of phenol.

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Textbook Question

Ascorbic 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,

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Textbook Question

The 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?

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Textbook Question

The 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.

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Textbook Question

Calculate the number of moles of solute present in each of the following aqueous solutions: (b) 86.4 g of 0.180 m KCl,

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Textbook Question

An 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.)

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Textbook Question

An 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.)

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Textbook Question

Describe how you would prepare each of the following aqueous solutions, starting with solid KBr: (b) 125 g of 0.180 m KBr,

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Textbook Question

Brass 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?

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Textbook Question

Describe how to prepare each solution from the dry solute and the solvent. b. 125 g of 0.100 m NaNO3

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Textbook Question

A 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. molality

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Textbook Question

What is the molality of the 40.0 mass % ethylene glycol 1C2H6O22 solution used for automobile antifreeze?

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Textbook Question

Ethylene 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/mol

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Textbook Question

Nalorphine 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?

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Textbook Question

A 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) Molality

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Textbook Question

Acetonitrile 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,

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Textbook Question

Fluorocarbons (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 0.30

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Textbook Question

There'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?

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Textbook Question

Addition 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.

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Open Question

What mass (in g) of nh3 must be dissolved in 475 g of methanol to make a 0.250 m solution?

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Open Question

What is the molar concentration of Na⁺ ions in 0.0250 m solutions of the following sodium salts in water?

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Open Question

Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water. Determine the molality of the HCl, if the solution has a density of 1.20 g/mL.

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Open Question

If we dissolve 36 grams of salt in 148 grams of water, what is the mass of the resulting solution?

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Open Question

What mass of NaCl is present in 50.0 g of 3.75% (m/m) NaCl solution?

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Open Question

What is the molality of a solution that has 3 mol of glucose in 6 kg of water?