Textbook Question
Methanol (CH3OH) can be made by the reaction of CO with H2: CO(π) + 2 H2(π) β CH3OH(π) (b) To maximize the equilibrium yield of methanol, would you use a high or low temperature?
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Ch.15 - Chemical Equilibrium
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement140
- Ch.2 - Atoms, Molecules, and Ions192
- Ch.3 - Chemical Reactions and Reaction Stoichiometry172
- Ch.4 - Reactions in Aqueous Solution156
- Ch.5 - Thermochemistry151
- Ch.6 - Electronic Structure of Atoms137
- Ch.7 - Periodic Properties of the Elements127
- Ch.8 - Basic Concepts of Chemical Bonding143
- Ch.9 - Molecular Geometry and Bonding Theories167
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces97
- Ch.12 - Solids and Modern Materials129
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics175
- Ch.15 - Chemical Equilibrium107
- Ch.16 - Acid-Base Equilibria127
- Ch.17 - Additional Aspects of Aqueous Equilibria133
- Ch.18 - Chemistry of the Environment88
- Ch.19 - Chemical Thermodynamics140
- Ch.20 - Electrochemistry137
- Ch.21 - Nuclear Chemistry99
- Ch.22 - Chemistry of the Nonmetals66
- Ch.23 - Transition Metals and Coordination Chemistry69
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry11
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 15, Problem 69a
(a) Is the dissociation of fluorine molecules into atomic fluorine, F2(π) β 2 F(π), an exothermic or endothermic process?
Verified step by step guidance1
Identify the type of reaction: The dissociation of fluorine molecules into atomic fluorine is a bond-breaking process.
Recall the general rule that breaking chemical bonds requires energy, while forming chemical bonds releases energy.
Determine the nature of the energy change: Since the reaction involves breaking the F-F bond in F2(g) to form atomic fluorine, energy is absorbed from the surroundings.
Conclude the type of thermodynamic process: If a reaction absorbs energy, it is considered endothermic.
State the answer: The dissociation of fluorine molecules into atomic fluorine is an endothermic process.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Dissociation Reactions
Dissociation reactions involve the breaking of bonds in a compound to form individual atoms or smaller molecules. In the case of fluorine, the reaction Fβ(g) β 2 F(g) represents the dissociation of diatomic fluorine into two monatomic fluorine atoms. Understanding this process is crucial for determining the energy changes associated with the reaction.
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Percent Dissociation Example
Exothermic vs. Endothermic Processes
Exothermic processes release energy, usually in the form of heat, while endothermic processes absorb energy from the surroundings. The classification of a reaction as exothermic or endothermic can be determined by the energy changes that occur during bond breaking and formation. This distinction is essential for analyzing the thermodynamics of the dissociation of fluorine.
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01:23Endothermic & Exothermic Reactions Example 2
Bond Energy
Bond energy is the amount of energy required to break a bond between two atoms. In the context of the dissociation of Fβ, the bond energy of the F-F bond must be considered to evaluate whether the process is exothermic or endothermic. If the energy required to break the bond is greater than the energy released when forming new bonds, the process is endothermic, and vice versa.
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Related Practice
Textbook Question
The waterβgas shift reaction CO1g2 + H2O1g2ΞCO21g2 + H21g2 is used industrially to produce hydrogen.The reaction enthalpy is H = -41 kJ.(b) Could you increase the equilibrium yieldof hydrogen by controlling the pressure of this reaction? Ifso would high or low pressure favor formation of H2(g)?
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Textbook Question
(b) If the temperature is raised by 100 K, does the equilibrium constant for this reaction increase or decrease?
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Textbook Question
Ozone, O3, decomposes to molecular oxygen in the stratosphere according to the reaction 2 O31g2Β‘3 O21g2. Would an increase in pressure favor the formation of ozone or of oxygen?
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