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 113
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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Identify the given reactions and their enthalpies: \( S(g) + O_2(g) \rightarrow SO_3(g) \) with \( \Delta H = -204 \text{ kJ/mol} \) and \( SO_2(g) + \frac{1}{2}O_2(g) \rightarrow SO_3(g) \) with \( \Delta H = 89.5 \text{ kJ/mol} \).
Write the target reaction for the formation of \( SO_2 \): \( S(g) + O_2(g) \rightarrow SO_2(g) \).
Use Hess's Law, which states that the total enthalpy change for a reaction is the sum of the enthalpy changes for each step of the reaction.
Express the enthalpy of formation of \( SO_2 \) as the difference between the enthalpy of the direct formation of \( SO_3 \) from \( S \) and the enthalpy of the conversion of \( SO_2 \) to \( SO_3 \).
Calculate \( \Delta H_f(SO_2) \) using the equation: \( \Delta H_f(SO_2) = \Delta H(S \rightarrow SO_3) - \Delta H(SO_2 \rightarrow SO_3) \).
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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). Understanding ΔH is crucial for calculating the energy changes associated with chemical reactions, such as the formation of compounds from their elements.
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02:34
Enthalpy of Formation
Hess's Law
Hess's Law states that the total enthalpy change for a reaction is the sum of the enthalpy changes for the individual steps of the reaction, regardless of the pathway taken. This principle allows us to calculate the enthalpy of formation of a compound by using known enthalpy changes of related reactions, facilitating the determination of ΔH for complex reactions.
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02:03Hess's Law
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. It is a fundamental concept in thermodynamics and is used to calculate the energy changes in chemical reactions. Knowing the enthalpy of formation is essential for predicting the stability and reactivity of compounds.
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02:34Enthalpy of Formation
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A gaseous fuel mixture contains 25.3% methane (CH4), 38.2% ethane (C2H6), and the rest propane (C3H8) by volume. When the fuel mixture contained in a 1.55 L tank, stored at 755 mmHg and 298 K, undergoes complete combustion, how much heat is emitted? (Assume that the water produced by the combustion is in the gaseous state.)
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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
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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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Domanda del libro di testo
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.
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