Domanda del libro di testo
Two compounds (labeled I and II) have a liquid crystal state. Predict which compound has a higher temperature associ- ated with the solid to liquid crystal phase change. Explain your reasoning.
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Ch.11 - Liquids & Phase Changes
McMurry8th EditionChemistryISBN: 9781292336145
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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 11, Problema 75
The chlorofluorocarbon refrigerant trichlorofluoromethane, CCl3F, has Pvap = 100.0 mm Hg at -23 °C and ΔHvap = 24.77 kJ>mol. (b) What is ΔSvap for trichlorofluoromethane?
Guida verificata passo dopo passo1
Step 1: Understand that the change in entropy of vaporization (ΔSvap) can be calculated using the Clausius-Clapeyron equation, which is ΔHvap = ΔSvap * T, where T is the temperature in Kelvin.
Step 2: Convert the given temperature from Celsius to Kelvin. The conversion formula is T(K) = T(°C) + 273.15.
Step 3: Convert the given ΔHvap from kJ/mol to J/mol by multiplying by 1000, because 1 kJ = 1000 J.
Step 4: Rearrange the Clausius-Clapeyron equation to solve for ΔSvap. The rearranged equation is ΔSvap = ΔHvap / T.
Step 5: Substitute the values of ΔHvap and T into the rearranged equation to calculate ΔSvap.
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Vaporization and Enthalpy of Vaporization (ΔHvap)
Vaporization is the process by which a liquid turns into vapor. The enthalpy of vaporization (ΔHvap) is the amount of energy required to convert one mole of a liquid into vapor at constant temperature and pressure. In this case, ΔHvap for trichlorofluoromethane is given as 24.77 kJ/mol, indicating the energy needed for its phase change from liquid to gas.
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Percorso guidato
01:37
Enthalpy of Vaporization Example
Entropy (ΔSvap)
Entropy is a measure of the disorder or randomness in a system. The change in entropy during vaporization (ΔSvap) can be calculated using the relationship between enthalpy and temperature. It reflects how much the disorder increases when a substance transitions from a liquid to a gas, which is crucial for understanding thermodynamic processes.
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Percorso guidato
02:46Entropy in Thermodynamics
Clausius-Clapeyron Equation
The Clausius-Clapeyron equation relates the vapor pressure of a substance to its temperature and enthalpy of vaporization. It can be used to derive the change in entropy during vaporization by the formula ΔSvap = ΔHvap / T, where T is the absolute temperature in Kelvin. This equation is essential for calculating ΔSvap for trichlorofluoromethane using the provided values.
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Percorso guidato
00:59Clausius-Clapeyron Equation
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Which of the following substances would you expect to have
a nonzero dipole moment? Explain, and show the direction
of each.
(a) Cl2O
(b) XeF4
(c) Chloroethane, CH3CH2Cl
(d) BF3
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Domanda del libro di testo
Substance X has a vapor pressure of 100 mm Hg at its triple point (48 °C). When 1 mol of X is heated at 1 atm pres- sure with a constant rate of heat input, the following heating curve is obtained:
(b) For each of the following, choose which phase of X (solid, liquid, or gas) fits the description.
(iii) Has the greatest specific heat
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Domanda del libro di testo
Draw three-dimensional structures of PCl3 and PCl5, and
then explain why one of the molecules has a dipole moment
and one does not.
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Domanda del libro di testo
The compound cholesteryl benzoate is a rod-like molecule that undergoes a phase change from the solid to the liq- uid crystal phase at 145.5 °C. When cholesteryl benzoate is mixed with cholesteryl oleyl carbonate, a molecule with a curved shape, the temperature of the solid to liquid crys- tal transition changes. Predict if the transition temperature increases or decreases and explain your reasoning.
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Domanda del libro di testo
Intermolecular forces are important in creating ordered arrangements in liquid crystals. What types of intermolecu- lar forces exist in a sample of the following compound?
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