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Name ________________________________________ Class _________________ Date _______________ Two students prepared aspirin according to the following reaction in which aceticanhydride, C4H6O3, reacts with salicylic acid, C7H6O3, to form aspirin, C9H8O4, andacetic acid, C2H4O2.
The procedure involved heating the reaction mixture in a water bath for 15 minutes at75 ЊC, not to exceed 80 °C. The mixture was removed from the water bath and distilledwater was added to decompose any unreacted acetic anhydride. The mixture was thenplaced in an ice bath for 5 minutes to facilitate the formation of aspirin crystals. Theaspirin crystals were collected using filtration. The aspirin crystals were dried and then transferred to a watch glass and massed.
Because their grades were partially based on accuracy, both students used their verybest lab technique. Which student got the better grade and why? 1. Determine the molar masses of:
a. acetic anhydride, C4H6O3.
b. salicylic acid, C7H6O3.
c. aspirin, C9H8O4.
Name ________________________________________ Class _________________ Date _______________ 2. How many moles of salicylic acid were added to the reaction mixture?
3. Given the density of acetic anhydride to be 1.05 g/mL, what was the mass of the
acetic anhydride added to the reaction? How many moles of acetic acid wereadded? 4. According to the mole ratios in the given reaction, what is the limiting reagent
5. What is the theoretical yield, in grams, of aspirin in each reaction?
6. What was the actual yield, in grams, of aspirin in each reaction?
7. What was the percent yield in each reaction?
8. Evaluate your answers. Which student got the better grade and why?
  • How to Use the Teaching Resources Library
  • 13: Balancing Chemical Equations
  • 14: Single-Replacement Reactions
  • 15: Double-Replacement Reactions
  • 21: Kinetic Energy and Temperature
  • 23: The Manometer and Vapor Pressure
  • 30: Pressure-Volume Relationship for a Gas
  • 34: Development of Atomic Models
  • 39: Emission Spectrum of an Element
  • 42: Periodic Table of the Elements (a)
  • 43: Periodic Table of the Elements (b)
  • 47: Atomic Radius vs. Atomic Number
  • 59: Electrolytes and Nonelectrolytes
  • 62: Concentrated and Dilute Solutions
  • 64: Activation Energy and Catalysts
  • 65: Reversible Reactions and Equilibrium
  • 67: Heat, Entropy, and Free Energy
  • 69: Dissociation of Weak and Strong Acids
  • 70: Oxidation-Reduction Reactions
  • 72: Voltaic and Electrolytic Cells
  • Section Review 1.2: Chemistry Far and Wide
  • Section Review 1.3: Thinking Like a Scientist
  • Section Review 1.4: How to Study Chemistry
  • Section Review 2.3: Elements and Compounds
  • Section Review 2.4: Chemical Reactions
  • Section Review 3.1: The Importance of Measurement
  • Section Review 3.2: Uncertainty in Measurement
  • Section Review 3.3: International System of Units
  • Section Review 4.1: What Do I Do Now?
  • Section Review 4.2: Simple Conversion Problems
  • Section Review 4.3 More-Complex Problems
  • Ch. 5: Atomic Structure and the Periodic Table
  • Section Review 5.2: Structure of the Nuclear Atom
  • Section Review 5.3: Distinguishing Between Atoms
  • Section Review 5.4: The Periodic Table: Organizing the Elements
  • Section Review 6.1: Introduction to Chemical Bonding
  • Section Review 6.2: Representing Chemical Compounds
  • Section Review 6.3: Ionic Charges
  • Section Review 6.4: Ionic Compounds
  • Section Review 6.5: Molecular Compounds and Acids
  • Section Review 6.6: Summary of Naming and Formula Writing
  • Section Review 7.1: The Mole: A Measure of Matter
  • Section Review 7.2: Mole-Mass and Mole-Volume Relationships
  • Section Review 7.3: Percent Composition and Chemical Formulas
  • Section Review 8.1: Describing Chemical Change
  • Section Review 8.2: Types of Chemical Reactions
  • Section Review 8.3: Reactions in Aqueous Solutions
  • Section Review 9.1: The Arithmetic of Equations
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  • Section Review 10.1: The Nature of Gases
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  • Section Review 14.1: Classification of the Elements
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  • Section Review 15.3: Bonding in Metals
  • Section Review 16.1: The Nature of Covalent bonds
  • Section Review 16.2: Bonding Theories
  • Section Review 16.3: Polar Bonds and Molecules
  • Section Review 17.1: Liquid Water and Its Properties
  • Section Review 17.2: Water Vapor and Ice
  • Section Review 17.3: Aqueous Solutions
  • Section Review 17.4: Heterogeneous Aqueous Systems
  • Section Review 18.1: Properties of Solutions
  • Section Review 18.2: Concentrations of Solutions
  • Section Review 18.3: Colligative Properties of Solutions
  • Section Review 18.4: Calculations involving Colligative Properties
  • Ch. 19: Reaction Rates and Equilibrium
  • Section Review 19.1: Rates of Reaction
  • Section Review 19.2: Reversible Reactions and Equilibrium
  • Section Review 19.3: Determining Whether a Reaction Will Occur
  • Section Review 19.4: Calculating Entropy and Free Energy
  • Section Review 19.5: The Progress of Chemical Reactions
  • Section Review 20.1: Describing Acids and Bases
  • Section Review 20.2: Hydrogen Ions and Acidity
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  • Section Review 20.4: Strengths of Acids and Bases
  • Section Review 21.1: Neutralization Reactions
  • Section Review 21.2: Salts in Solution
  • Ch. 22: Oxidation-Reduction Reactions
  • Section Review 22.1: The Meaning of Oxidation and Reduction
  • Section Review 22.2: Oxidation Numbers
  • Section Review 22.3: Balancing Redox Equations
  • Section Review 23.1: Electrochemical Cells
  • Section Review 23.2: Half-Cells and Cell Potential
  • Section Review 23.3: Electrolytic Cells
  • Ch. 24: The Chemistry of Metals and Nonmetals
  • Section Review 24.1: The s-Block Elements: Active Metals
  • Section Review 24.2: The p-Block Elements: Metals and Nonmetals
  • Section Review 24.3: The d- and f-Block Elements: Transitional Metals
  • Section Review 24.4: Hydrogen and Noble Gases
  • Section Review 25.1: Hydrocarbons
  • Section Review 25.2: Unsaturated Hydrocarbons
  • Section Review 25.4: Hydrocarbon Rings
  • Section Review 25.5: Hydrocarbons from the Earth
  • Ch. 26: Functional Groups and Organic Reactions
  • Section Review 26.1: Introduction to Functional Groups
  • Section Review 26.2: Alcohols and Ethers
  • Section Review 26.3: Carbonyl Compounds
  • Section Review 26.4: Polymerization
  • Section Review 27.1: A Strategy for Life
  • Section Review 27.2: Carbohydrates
  • Section Review 27.3: Amino Acids and Their Polymers
  • Section Review 27.5: Nucleic Acids
  • Section Review 28.1: Nuclear Radiation
  • Section Review 28.2: Nuclear Transformation
  • Section Review 28.3: Fission and Fusion of Atomic Nuclei
  • Section Review 28.4: Radiation in Your Life
  • Ch. 1: Introduction to Chemistry
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  • Ch. 5: Atomic Structure and the Periodic Table
  • Ch. 6: Chemical Names and Formulas
  • Ch. 11: Thermochemistry--Heat and Chemical Change
  • Ch. 15: Ionic Bonding and Ionic Compounds
  • Ch. 17: Water and Aqueous Systems
  • Ch. 19: Reaction Rates and Equilibrium
  • Ch. 22: Oxidation-Reduction Reactions
  • Ch. 24: The Chemistry of Metals and Nonmetals
  • Ch. 26: Functional Groups and Organic Reactions
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  • Suggested Format for Planning Daily Block Lessons
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  • Capítulo 1: Introducción a la química (Introduction to Chemistry)
  • Capítulo 2: La materia y sus cambios (Matter and Change)
  • Capítulo 3: La medición científica (Scientific Measurement)
  • Capítulo 4: Resolución de problemas en la química (Problem Solving in Chemistry)
  • Capítulo 5: La estructura atómica y la tabla periódica (Atomic Structure and the Periodic Table)
  • Capítulo 6: Fórmulas y nombres químicos (Chemical Names and Formulas)
  • Capítulo 7: Las cantidades químicas (Chemical Quantities)
  • Capítulo 8: Las reacciones químicas (Chemical Reactions)
  • Capítulo 9: La estequiometría (Stoichiotometry)
  • Capítulo 10: Los estados de la materia (States of Matter)
  • Capítulo 11: La termoquímica: el calor y el cambio químico (Thermochemistry--Heat and Chemical Change)
  • Capítulo 12: El comportamiento de los gases (The Behavior of Gases)
  • Capítulo 13: Los electrones en los átomos (Electrons in Atoms)
  • Capítulo 14: Periodicidad química (Chemical Periodicity)
  • Capítulo 15: Los enlaces iónicos y los compuestos iónicos (Ionic Bonding and Ionic Compounds)
  • Capítulo 16: Los enlaces covalentes (Covalent Bondinng)
  • Capítulo 17: El agua y los sistemas acuosos (Water and Aqueous Systems)
  • Capítulo 18: Las soluciones (Solutions)
  • Capítulo 19: Las velocidades de reacción y el equilibrio (Reaction Rates and Equilibrium)
  • Capítulo 20: Los ácidos y las bases (Acids and Bases)
  • Capítulo 21: Neutralización (Neutralization)
  • Capítulo 22: Las reacciones de óxido-reducción (Oxidation-Reduction Reactions)
  • Capítulo 23: La electroquímica (Electrochemistry)
  • Capítulo 24: La química de los metales y los no metales (The Chemistry of Metals and Nonmetals)
  • Capítulo 25: Los compuestos de hidrocarburos (Hydrocarbon Compounds)
  • Capítulo 26: Los grupos funcionales y las reacciones orgánicas (Functional Groups and Organic Reactions)
  • Capítulo 27: La química de la vida (The Chemistry of Life)
  • Capítulo 28: La química nuclear (Nuclear Chemistry)
  • Source: http://mail.kenton.k12.ny.us/~Bob_ventola/chemistry/crm0906.pdf

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