Domanda del libro di testo
An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate the mass percent of the solution. (Assume a density of 1.08 g/mL for the solution.)
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Ch.13 - Solutions
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831
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TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving136
- Ch.2 - Atoms & Elements112
- Ch.3 - Molecules, Compounds & Chemical Equations159
- Ch.4 - Chemical Quantities & Aqueous Reactions140
- Ch.5 - Gases118
- Ch.6 - Thermochemistry106
- Ch.7 - Quantum-Mechanical Model of the Atom62
- Ch.8 - Periodic Properties of the Elements103
- Ch.9 - Chemical Bonding I: The Lewis Model104
- Ch.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory89
- Ch.11 - Liquids, Solids & Intermolecular Forces73
- Ch.12 - Solids and Modern Material59
- Ch.13 - Solutions110
- Ch.14 - Chemical Kinetics140
- Ch.15 - Chemical Equilibrium78
- Ch.16 - Acids and Bases155
- Ch.17 - Aqueous Ionic Equilibrium176
- Ch.18 - Free Energy and Thermodynamics108
- Ch.19 - Electrochemistry118
- Ch.20 - Radioactivity and Nuclear Chemistry82
- Ch.21 - Organic Chemistry150
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Capitolo 13, Problema 52b
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.)
Guida verificata passo dopo passo1
Step 1: Convert the mass of KNO3 to moles. The molar mass of KNO3 is approximately 101.1 g/mol. So, the number of moles of KNO3 can be calculated by dividing the given mass of KNO3 by its molar mass.
Step 2: Convert the volume of the solution to kilograms. Since the density of the solution is given as 1.05 g/mL, you can first convert the volume of the solution from liters to milliliters, and then multiply by the density to find the mass in grams. Finally, convert the mass from grams to kilograms by dividing by 1000.
Step 3: Calculate the molality of the solution. Molality is defined as the number of moles of solute per kilogram of solvent. In this case, the solute is KNO3 and the solvent is water. So, the molality can be calculated by dividing the number of moles of KNO3 by the mass of the water in kilograms.
Step 4: Remember that the volume of the solution is not the same as the volume of the solvent. In this case, the volume of the solution is given, but the volume of the solvent (water) is not. However, because the solution is dilute, we can assume that the volume of the water is approximately equal to the total volume of the solution.
Step 5: Finally, express your answer in the appropriate units. Molality is typically expressed in moles per kilogram (mol/kg).
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Molarity and Molality
Molarity (M) is defined as the number of moles of solute per liter of solution, while molality (m) is the number of moles of solute per kilogram of solvent. Understanding the difference between these two concentration units is crucial for solving problems involving solutions, especially when the volume and mass of the solvent are involved.
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Percorso guidato
00:40
Molality
Calculating Moles from Mass
To find the number of moles of a substance, you can use the formula: moles = mass (g) / molar mass (g/mol). For KNO3, the molar mass is approximately 101.1 g/mol. This calculation is essential for determining the concentration of the solution in terms of molality.
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Percorso guidato
03:12Molar Mass Calculation Example
Density and Volume Relationships
Density is defined as mass per unit volume (g/mL or g/cm³). In this problem, the density of the solution is given as 1.05 g/mL, which allows us to convert the total volume of the solution into mass. This conversion is necessary to calculate the mass of the solvent, which is required for determining molality.
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Percorso guidato
01:09Relationship of Volume and Moles Example
Pratica correlata
Domanda del libro di testo
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.)
2637
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Domanda del libro di testo
An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate the mass percent of the solution. (Assume a density of 1.05 g/mL for the solution.)
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Domanda del libro di testo
An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate the molarity of the solution. (Assume a density of 1.05 g/mL for the solution.)
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Domanda del libro di testo
To what volume should you dilute 50.0 mL of a 5.00 M KI solution so that 25.0 mL of the diluted solution contains 3.05 g of KI?
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