14. Solutions
Molality
14. Solutions
Molality - Video Tutorials & Practice Problems
Get help from an AI Tutor
Ask a question to get started.
Molality (m) represents the number of moles of solute dissolved per kilogram of solvent.
Understanding Molality
1
concept
Molality Concept 1
Video duration:
40sPlay a video:
2
example
Molality Example 1
Video duration:
2mPlay a video:
3
Problem
ProblemA 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?
A
1.99 m
B
3.51 m
C
2.64 m
D
4.70 m
4
Problem
ProblemThe 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?
A
44.2 m
B
18.3 m
C
31.2 m
D
23.7 m
Osmolality
5
concept
Molality Concept 2
Video duration:
1mPlay a video:
Osmolality or Ionic Molality, represents number of dissolved particles in a solution.
6
example
Molality Example 2
Video duration:
1mPlay a video:
7
Problem
ProblemWhat 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.
A
1.98 m
B
2.57 m
C
4.74 m
D
2.37 m
Do you want more practice?
We have more practice problems on Molality
Additional resources for Molality
PRACTICE PROBLEMS AND ACTIVITIES (26)
- The figure shows two identical volumetric flasks containing the same solution at two temperatures. (b) Does th...
- A solution is made containing 20.8 g of phenol 1C6H5OH2 in 425 g of ethanol 1CH3CH2OH2. Calculate (c) the mola...
- Ascorbic acid 1vitamin C, C6H8O62 is a water-soluble vitamin. A solution containing 80.5 g of ascorbic acid di...
- The density of acetonitrile 1CH3CN2 is 0.786 g>mL and the density of methanol 1CH3OH2 is 0.791 g>mL. A s...
- The density of toluene 1C7H82 is 0.867 g>mL, and the density of thiophene 1C4H4S2 is 1.065 g>mL. A solut...
- Calculate the number of moles of solute present in each of the following aqueous solutions: (b) 86.4 g of 0.18...
- An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate t...
- An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate ...
- Describe how you would prepare each of the following aqueous solutions, starting with solid KBr: (b) 125 g of ...
- Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass ...
- Describe how to prepare each solution from the dry solute and the solvent. b. 125 g of 0.100 m NaNO3
- A solution is prepared by dissolving 20.2 mL of methanol (CH3OH) in 100.0 mL of water at 25 °C. The final volu...
- What is the molality of the 40.0 mass % ethylene glycol 1C2H6O22 solution used for automobile antifreeze?
- Ethylene glycol, C2H6O2, is a colorless liquid used as auto-mobile antifreeze. If the density at 20 °C of a 4....
- Nalorphine 1C19H21NO3 2, a relative of morphine, is used to combat withdrawal symptoms in narcotics users. How...
- A 0.944 M solution of glucose, C6H12O6, in water has a density of 1.0624 g/mL at 20 °C. What is the concentrat...
- Acetonitrile 1CH3CN2 is a polar organic solvent that dissolves a wide range of solutes, including many salts. ...
- Fluorocarbons (compounds that contain both carbon and fluorine) were, until recently, used as refrigerants. Th...
- There's actually much more in seawater than just dissolved NaCl. Major ions present include 19,000 ppm Cl-, 10...
- 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...
- What mass (in g) of nh3 must be dissolved in 475 g of methanol to make a 0.250 m solution?
- What is the molar concentration of Na+ ions in 0.0250 m solutions of the following sodium salts in water?
- Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water. Determine the molality of the HCl, ...
- If we dissolve 36 grams of salt in 148 grams of water, what is the mass of the resulting solution?
- What mass of NaCl is present in 50.0 g of 3.75% (m/m) NaCl solution?
- What is the molality of a solution that has 3 mol of glucose in 6 kg of water?