Domanda del libro di testo
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 48b
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?
Guida verificata passo dopo passo1
Identify the given reaction and its enthalpy change: The decomposition of 1 mole of liquid benzene (C6H6(l)) into 3 moles of gaseous acetylene (C2H2(g)) has an enthalpy change (ΔH) of +630 kJ.
Understand the relationship between the moles of benzene and acetylene: From the reaction, 1 mole of benzene produces 3 moles of acetylene.
Calculate the enthalpy change per mole of acetylene produced: Since the total enthalpy change for the reaction is +630 kJ for 3 moles of acetylene, divide this value by 3 to find the enthalpy change per mole of acetylene.
Express the enthalpy change for the formation of 1 mole of acetylene: The result from the previous step gives the enthalpy change (ΔH) for the formation of 1 mole of acetylene from benzene.
Note the sign of ΔH: Since the overall reaction is endothermic (+630 kJ), the enthalpy change per mole of acetylene will also be positive, indicating that energy is absorbed in the formation of acetylene from benzene.
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Thermochemistry
Thermochemistry is the study of the heat energy associated with chemical reactions and physical transformations. It involves understanding how energy is absorbed or released during these processes, which is crucial for calculating enthalpy changes (ΔH). In the given reaction, the positive ΔH indicates that the decomposition of benzene is endothermic, meaning it requires energy input.
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Percorso guidato
01:49
Chemical Bonds
Enthalpy of Formation
The enthalpy of formation (ΔH_f) is the change in enthalpy when one mole of a compound is formed from its elements in their standard states. This concept is essential for determining the energy changes associated with the formation of products from reactants. In this case, calculating the enthalpy for the formation of acetylene involves using the enthalpy change of the decomposition reaction and stoichiometric relationships.
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02:34Enthalpy of Formation
Stoichiometry
Stoichiometry is the quantitative relationship between reactants and products in a chemical reaction. It allows chemists to calculate the amounts of substances consumed and produced in a reaction based on balanced chemical equations. For the decomposition of benzene to acetylene, stoichiometry helps determine how the enthalpy change relates to the formation of one mole of acetylene from the given reaction.
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Percorso guidato
01:16Stoichiometry Concept
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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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Consider the combustion of isopropanol, C3H7OH(l), which is the primary component of rubbing alcohol: C3H7OH(l) + 9/2 O2(g) → 3 CO2(g) + 4 H2O(l) ΔH = -2248 kJ (b) Balance the forward reaction with whole-number coefficients. What is ΔH for the reaction represented by this equation?
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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 (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.
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Domanda del libro di testo
Consider the combustion of isopropanol, C3H7OH(l), which is the primary component of rubbing alcohol: C3H7OH(l) + 9/2 O2(g) → 3 CO2(g) + 4 H2O(l) ΔH = -2248 kJ a. What is the enthalpy change for the reverse reaction?
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