Domanda del libro di testo
(d) What is the kinetic energy of an electron traveling at velocity (c)?
406
views
Ch.9 - Thermochemistry: Chemical Energy
McMurry8th EditionChemistryISBN: 9781292336145
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
Capitolo 9, Problema 138
Ethyl alcohol has ΔHfusion = 5.02 kJ/mol and melts at - 114.1 °C. What is the value of ΔSfusion for ethyl alcohol?
Guida verificata passo dopo passo1
Identify the formula to calculate the change in entropy (\( \Delta S \)) during the phase transition: \( \Delta S = \frac{\Delta H}{T} \).
Note that \( \Delta H_{\text{fusion}} \) is given as 5.02 kJ/mol.
Convert the melting point from Celsius to Kelvin by adding 273.15 to the Celsius temperature: \( T = -114.1 + 273.15 \).
Substitute the values of \( \Delta H_{\text{fusion}} \) and \( T \) (in Kelvin) into the formula: \( \Delta S = \frac{5.02 \text{ kJ/mol}}{T} \).
Ensure the units are consistent, typically converting \( \Delta H \) to J/mol if \( \Delta S \) is required in J/(mol·K).
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
2mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Enthalpy of Fusion (ΔH<sub>fusion</sub>)
The enthalpy of fusion is the amount of energy required to change a substance from solid to liquid at its melting point. For ethyl alcohol, this value is given as 5.02 kJ/mol, indicating the energy needed to overcome intermolecular forces during the melting process.
Video consigliato:
Percorso guidato
03:17
Enthalpy of Formation Example 1
Entropy (ΔS)
Entropy is a measure of the disorder or randomness in a system. When a solid melts into a liquid, the entropy increases because the molecules have more freedom to move. The change in entropy during fusion (ΔS<sub>fusion</sub>) can be calculated using the relationship between enthalpy and temperature.
Video consigliato:
Percorso guidato
02:46Entropy in Thermodynamics
Gibbs Free Energy and Phase Changes
The Gibbs free energy change (ΔG) during a phase change can be expressed as ΔG = ΔH - TΔS. At equilibrium, such as at the melting point, ΔG is zero, allowing us to relate ΔH<sub>fusion</sub> and ΔS<sub>fusion</sub> to find the entropy change using the formula ΔS<sub>fusion</sub> = ΔH<sub>fusion</sub> / T, where T is the absolute temperature in Kelvin.
Video consigliato:
Percorso guidato
01:51Gibbs Free Energy of Reactions
Pratica correlata
Domanda del libro di testo
What is the melting point of benzene in kelvin if ΔHfusion = 9.95 kJ/mol and ΔSfusion = 35.7 J/(K mol)?
485
views
Domanda del libro di testo
Metallic mercury is obtained by heating the mineral cinnabar (HgS) in air:
HgS1s2 + O21g2 S Hg1l2 + SO21g2
(a) Use the data in Appendix B to calculate ΔH° in kilojoules for the reaction.
720
views