Domanda del libro di testo
If hydrogen were used as a fuel, it could be burned according to this reaction: H2(g) + 1/2 O2(g) → H2O(g) Use average bond energies to calculate ΔHrxn for this reaction.
676
views
Ch.9 - Chemical Bonding I: The Lewis Model
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
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 9, Problema 105c
If hydrogen were used as a fuel, it could be burned according to this reaction: H2(g) + 1/2 O2(g) → H2O(g) Which fuel yields more energy per mole?
Guida verificata passo dopo passo1
Identify the reaction given and the products formed. In this case, the reaction is the combustion of hydrogen gas (H2) with oxygen gas (O2) to form water vapor (H2O).
Understand that the energy yield from a reaction can be determined by looking at the enthalpy change (ΔH) of the reaction. For combustion reactions, this is typically exothermic, meaning it releases energy.
Consult standard enthalpy of formation tables or reliable chemical data sources to find the ΔH values for the reactants and products involved in the reaction.
Calculate the net energy yield by using the formula: ΔH = ΣΔHproducts - ΣΔHreactants. This will give the energy released or absorbed per mole of reaction.
Compare the energy yield of hydrogen combustion with that of other common fuels (like methane, propane, etc.) using their respective ΔH values for combustion to determine which fuel yields more energy per mole.
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:
12mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Combustion Reactions
Combustion reactions involve the chemical reaction of a fuel with an oxidant, typically oxygen, resulting in the release of energy in the form of heat and light. In the case of hydrogen, the reaction with oxygen produces water vapor and releases energy, making it a highly efficient fuel. Understanding the stoichiometry of combustion reactions is essential for calculating energy yields.
Video consigliato:
Percorso guidato
02:24
Combustion Apparatus
Enthalpy of Combustion
The enthalpy of combustion is the amount of energy released when one mole of a substance is completely burned in oxygen. This value is crucial for comparing the energy output of different fuels. For hydrogen, the enthalpy of combustion is significantly high, indicating that it releases a large amount of energy per mole when combusted.
Video consigliato:
Percorso guidato
02:24Combustion Apparatus
Molar Mass and Energy Density
Molar mass refers to the mass of one mole of a substance, which affects the energy density of fuels. Energy density is the amount of energy stored in a given volume or mass of fuel. When comparing fuels, it is important to consider both the molar mass and the energy released per mole to determine which fuel is more efficient in terms of energy output.
Video consigliato:
Percorso guidato
02:11Molar Mass Concept
Pratica correlata
Domanda del libro di testo
If hydrogen were used as a fuel, it could be burned according to this reaction: H2(g) + 1/2 O2(g) → H2O(g) Which fuel yields more energy per gram?
828
views
Domanda del libro di testo
Free radicals are important in many environmentally significant reactions (see the Chemistry in the Environment box on free radicals in this chapter). For example, photochemical smog— smog that results from the action of sunlight on air pollutants— forms in part by these two steps:
The product of this reaction, ozone, is a pollutant in the lower atmosphere. (Upper atmospheric ozone is a natural part of the atmosphere that protects life on Earth from ultraviolet light.) Ozone is an eye and lung irritant and also accelerates the weathering of rubber products. Rewrite the given reactions using the Lewis structure of each reactant and product. Identify the free radicals.
552
views
Domanda del libro di testo
Calculate ΔHrxn for the combustion of octane (C8H18), a component of gasoline, by using average bond energies and then calculate it using enthalpies of formation from Appendix IIB. What is the percent difference between your results? Which result would you expect to be more accurate?
2412
views
Domanda del libro di testo
If hydrogen were used as a fuel, it could be burned according to this reaction: H2(g) + 1/2 O2(g) → H2O(g) Use average bond energies to calculate ΔHrxn for the combustion of methane (CH4).
756
views