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b. What are the units of specific heat?
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Ch.5 - Thermochemistry
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 5, Problema 48d
Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): C6H6(l) → 3 C2H2(g) ΔH = +630 kJ (d) If C6H6(g) were consumed instead of C6H6(l), would you expect the magnitude of ΔH to increase, decrease, or stay the same? Explain.
Guida verificata passo dopo passo1
Identify the phase change involved in the reaction. In the original reaction, benzene is in the liquid phase (C6H6(l)). If it were in the gaseous phase (C6H6(g)), this introduces a phase change from liquid to gas.
Recall that converting a substance from liquid to gas requires energy, known as the heat of vaporization. This energy is absorbed by the substance to overcome intermolecular forces.
Understand that the heat of reaction (ΔH) for a process includes all energy changes, including phase changes. If benzene starts as a gas instead of a liquid, the energy required for vaporization is not needed in the reaction pathway.
Consider how the absence of the heat of vaporization in the reaction pathway would affect the overall ΔH. Since the vaporization step (which absorbs energy) is omitted, the total energy change for the reaction would be less positive.
Conclude that if C6H6(g) were consumed instead of C6H6(l), the magnitude of ΔH would decrease because the reaction would not need to absorb the additional energy required for vaporizing liquid benzene.
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Enthalpy Change (ΔH)
Enthalpy change (ΔH) is a measure of the heat content of a system at constant pressure. It indicates whether a reaction is exothermic (releases heat, ΔH < 0) or endothermic (absorbs heat, ΔH > 0). In this case, the positive ΔH of +630 kJ signifies that the decomposition of liquid benzene into gaseous acetylene is an endothermic process, requiring energy input.
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02:34
Enthalpy of Formation
Phase Changes and Energy
The phase of a substance significantly affects its energy content. Transitioning from a liquid to a gas requires energy to overcome intermolecular forces, which is reflected in the enthalpy change. If benzene is in the gaseous state, it has already absorbed energy to vaporize, potentially altering the overall energy dynamics of the reaction compared to starting with liquid benzene.
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01:46Entropy in Phase Changes
Reaction Pathway and Thermodynamics
The thermodynamic properties of a reaction can vary based on the initial and final states of the reactants. The pathway taken during a reaction, including the states of matter involved, can influence the total energy change. If gaseous benzene is consumed instead of liquid, the energy required for the reaction may differ, potentially leading to a different ΔH value, depending on the energy already present in the gaseous state.
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01:18First Law of Thermodynamics
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Domanda del libro di testo
Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): C6H6(l) → 3 C2H2(g) ΔH = +630 kJ (c) Which is more likely to be thermodynamically favored, the forward reaction or the reverse reaction?
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Domanda del libro di testo
Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): C6H6(l) → 3 C2H2(g) ΔH = +630 kJ (a) What is the enthalpy change for the reverse reaction?
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Domanda del libro di testo
Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): C6H6(l) → 3 C2H2(g) ΔH = +630 kJ (b) What is H for the formation of 1 mol of acetylene?
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Domanda del libro di testo
Two solid objects, A and B, are placed in boiling water and allowed to come to the temperature of the water. Each is then lifted out and placed in separate beakers containing 1000 g of water at 10.0 °C. Object A increases the water temperature by 3.50 °C; B increases the water temperature by 2.60 °C. (a) Which object has the larger heat capacity?
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Domanda del libro di testo
(c) What is the heat capacity of 185 g of liquid water?
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