Domanda del libro di testo
The ΔH°f of TiI3(s) is –328 kJ/mol and the ΔH ° for the reaction 2 Ti(s) + 3 I2(g) → 2 TiI3(s) is –839 kJ. Calculate the ΔH of sublimation of I2(s), which is a solid at 25 °C.
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Ch.6 - Thermochemistry
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831
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TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving136
- Ch.2 - Atoms & Elements112
- Ch.3 - Molecules, Compounds & Chemical Equations159
- Ch.4 - Chemical Quantities & Aqueous Reactions140
- Ch.5 - Gases118
- Ch.6 - Thermochemistry106
- Ch.7 - Quantum-Mechanical Model of the Atom62
- Ch.8 - Periodic Properties of the Elements103
- Ch.9 - Chemical Bonding I: The Lewis Model104
- Ch.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory89
- Ch.11 - Liquids, Solids & Intermolecular Forces73
- Ch.12 - Solids and Modern Material59
- Ch.13 - Solutions110
- Ch.14 - Chemical Kinetics140
- Ch.15 - Chemical Equilibrium78
- Ch.16 - Acids and Bases155
- Ch.17 - Aqueous Ionic Equilibrium176
- Ch.18 - Free Energy and Thermodynamics108
- Ch.19 - Electrochemistry118
- Ch.20 - Radioactivity and Nuclear Chemistry82
- Ch.21 - Organic Chemistry150
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Non è quello che usi tu?Cambia libro di testo
Capitolo 6, Problema 111d
A 20.0-L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.0 atm. Enough weight is suddenly removed from the piston to lower the external pressure to 1.5 atm. The gas then expands at constant temperature until its pressure is 1.5 atm. Find w.
Guida verificata passo dopo passo1
Identify the type of process: The problem describes an isothermal expansion of an ideal gas, where the temperature remains constant.
Use the formula for work done by an ideal gas during isothermal expansion: \( w = -nRT \ln\left(\frac{V_f}{V_i}\right) \). However, since we don't have \( n \) or \( T \), we can use the pressure-volume relationship for isothermal processes.
Apply the ideal gas law to relate initial and final states: \( P_iV_i = P_fV_f \) since \( nRT \) is constant.
Rearrange the equation to find the final volume \( V_f \): \( V_f = \frac{P_iV_i}{P_f} \).
Calculate the work done using the formula for work in terms of pressure and volume change: \( w = -P_{ext} \Delta V \), where \( \Delta V = V_f - V_i \) and \( P_{ext} = 1.5 \text{ atm} \).
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Ideal Gas Law
The Ideal Gas Law relates the pressure, volume, temperature, and number of moles of an ideal gas through the equation PV = nRT. This law is fundamental in understanding gas behavior under varying conditions, such as changes in pressure and volume, which are central to the question regarding the gas expansion.
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Percorso guidato
01:15
Ideal Gas Law Formula
Work Done by a Gas
In thermodynamics, the work done by a gas during expansion or compression can be calculated using the formula w = -P_extΔV, where P_ext is the external pressure and ΔV is the change in volume. This concept is crucial for determining the work done when the gas expands against a lower external pressure.
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Percorso guidato
01:52Work Function Calculation Example
Isothermal Process
An isothermal process occurs at a constant temperature, meaning that the internal energy of an ideal gas remains unchanged during expansion or compression. In this scenario, since the gas expands isothermally, the temperature remains constant, which influences how we calculate the work done and the relationship between pressure and volume.
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Percorso guidato
04:20Spontaneity of Processes
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Domanda del libro di testo
Under certain nonstandard conditions, oxidation by O2(g) of 1 mol of SO2(g) to SO3(g) absorbs 89.5 kJ. The enthalpy of formation of SO3(g) is –204.2 kJ under these conditions. Find the enthalpy of formation of SO2(g).
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Domanda del libro di testo
A mixture of 2.0 mol of H2(g) and 1.0 mol of O2(g) is placed in a sealed evacuated container made of a perfect insulating material at 25 °C. The mixture is ignited with a spark and reacts to form liquid water. Determine the temperature of the water.
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Domanda del libro di testo
The ΔH for the oxidation of sulfur in the gas phase to SO3 is –204 kJ/mol and for the oxidation of SO2 to SO3 is 89.5 kJ/mol. Find the enthalpy of formation of SO2 under these conditions.
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Domanda del libro di testo
When 10.00 g of phosphorus is burned in O2(g) to form P4O10(s), enough heat is generated to raise the temperature of 2950 g of water from 18.0 °C to 38.0 °C. Calculate the enthalpy of formation of P4O10(s) under these conditions.
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