Domanda del libro di testo
Calculate the molarity of the following aqueous solutions: (c) 25.0 mL of 3.50 M HNO3 diluted to 0.250 L.
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Ch.13 - Properties of Solutions
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement146
- Ch.2 - Atoms, Molecules, and Ions200
- Ch.3 - Chemical Reactions and Reaction Stoichiometry176
- Ch.4 - Reactions in Aqueous Solution155
- Ch.5 - Thermochemistry126
- Ch.6 - Electronic Structure of Atoms131
- Ch.7 - Periodic Properties of the Elements126
- Ch.8 - Basic Concepts of Chemical Bonding123
- Ch.9 - Molecular Geometry and Bonding Theories143
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces91
- Ch.12 - Solids and Modern Materials122
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics174
- Ch.15 - Chemical Equilibrium101
- Ch.16 - Acid-Base Equilibria139
- Ch.17 - Additional Aspects of Aqueous Equilibria146
- Ch.18 - Chemistry of the Environment72
- Ch.19 - Chemical Thermodynamics129
- Ch.20 - Electrochemistry142
- Ch.21 - Nuclear Chemistry101
- Ch.22 - Chemistry of the Nonmetals68
- Ch.23 - Transition Metals and Coordination Chemistry66
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry10
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Capitolo 13, Problema 42c
A solution is made containing 20.8 g of phenol (C6H5OH) in 425 g of ethanol (CH3CH2OH). Calculate (c) the molality of phenol.
Guida verificata passo dopo passo1
Identify the formula for molality: \( m = \frac{\text{moles of solute}}{\text{kilograms of solvent}} \).
Calculate the moles of phenol (C_6H_5OH) using its molar mass. The molar mass of phenol is approximately 94.11 g/mol.
Convert the mass of phenol to moles by dividing the given mass (20.8 g) by the molar mass of phenol.
Convert the mass of ethanol (solvent) from grams to kilograms by dividing 425 g by 1000.
Substitute the moles of phenol and the kilograms of ethanol into the molality formula to find the molality of the solution.
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Molality
Molality is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per kilogram of solvent. It is expressed in units of moles per kilogram (mol/kg). Unlike molarity, which depends on the volume of the solution, molality is based solely on the mass of the solvent, making it particularly useful in situations where temperature changes may affect volume.
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00:40
Molality
Molar Mass
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). To calculate molality, it is essential to determine the molar mass of the solute—in this case, phenol (C6H5OH)—to convert the mass of the solute into moles. The molar mass is calculated by summing the atomic masses of all the atoms in the molecular formula.
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02:11Molar Mass Concept
Solvent and Solute
In a solution, the solute is the substance that is dissolved, while the solvent is the substance that does the dissolving. In this question, phenol is the solute and ethanol is the solvent. Understanding the roles of solute and solvent is crucial for calculating properties like molality, as it directly influences the amount of solute relative to the mass of the solvent.
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01:39Solution Components
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