Domanda del libro di testo
(d) What is the molarity of the KOH solution prepared in part (c), and how many milliliters of 0.554 M H2SO4 are required to neutralize it?
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Ch.9 - Thermochemistry: Chemical Energy
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 9, Problema 155
Reaction of gaseous fluorine with compound X yields a sin- gle product Y, whose mass percent composition is 61.7% F and 38.3% Cl. (c) Calculate ΔH° for the synthesis of Y using the following information: 2 CIF1g2 + O21g2 S Cl2O1g2 + OF21g2 ΔH° = + 205.4 kJ 2 CIF31l2 + 2 O21g2 S Cl2O1g2 + 3 OF21g2 ΔH° = + 532.8 kJ OF21g2 ΔH°f = + 24.5 kJ>mol
Guida verificata passo dopo passo1
Identify the chemical formula of compound Y based on its mass percent composition: 61.7% F and 38.3% Cl. This suggests the formula is ClF3.
Write the balanced chemical equation for the formation of ClF3 from its elements: Cl2(g) + 3F2(g) -> 2ClF3(g).
Use Hess's Law to calculate the enthalpy change (ΔH°) for the formation of ClF3. This involves manipulating the given reactions to derive the desired reaction.
Reverse the first given reaction to express Cl2O and OF2 as reactants, and adjust the enthalpy change accordingly: Cl2O(g) + OF2(g) -> 2ClF(g) + O2(g), ΔH° = -205.4 kJ.
Combine the reversed first reaction and the second given reaction to eliminate intermediates and obtain the formation reaction of ClF3. Calculate the overall ΔH° using the enthalpy changes of the manipulated reactions.
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Stoichiometry
Stoichiometry is the calculation of reactants and products in chemical reactions based on the conservation of mass. It involves using balanced chemical equations to determine the relationships between the amounts of substances consumed and produced. Understanding stoichiometry is essential for calculating the quantities needed for reactions and for interpreting the results of chemical equations.
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Percorso guidato
01:16
Stoichiometry Concept
Enthalpy Change (ΔH°)
Enthalpy change (ΔH°) refers to the heat content change during a chemical reaction at constant pressure. It indicates whether a reaction is exothermic (releases heat, ΔH° < 0) or endothermic (absorbs heat, ΔH° > 0). Knowing the enthalpy changes of related reactions allows for the application of Hess's law, which states that the total enthalpy change for a reaction is the sum of the enthalpy changes for individual steps.
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Percorso guidato
02:34Enthalpy of Formation
Mass Percent Composition
Mass percent composition is a way to express the concentration of an element in a compound as a percentage of the total mass of the compound. It is calculated by dividing the mass of the element by the total mass of the compound and multiplying by 100. This concept is crucial for determining the empirical formula of a compound and for understanding the proportions of elements involved in chemical reactions.
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Percorso guidato
00:38Mass Percent Calculation
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Domanda del libro di testo
Reaction of gaseous fluorine with compound X yields a single product Y, whose mass percent composition is 61.7% F and 38.3% Cl. (a) What is a probable molecular formula for product Y, and what is a probable formula for X?
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Domanda del libro di testo
(c) Assume that a chunk of potassium weighing 7.55 g is dropped into 400.0 g of water at 25.0 °C. What is the final temperature of the water if all the heat released is used to warm the water?
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Domanda del libro di testo
Hydrazine, a component of rocket fuel, undergoes combus- tion to yield N2 and H2O:
N2H41l2 + O21g2 S N21g2 + 2 H2O1l2 (b) Use the following information to set up a Hess's law cycle, and then calculate ΔH° for the combustion reac- tion. You will need to use fractional coefficients for some equations.
2 NH31g2 + 3 N2O1g2 S 4 N21g2 + 3 H2O1l2
ΔH° = - 1011.2 kJ N2O1g2 + 3 H21g2 S N2H41l2 + H2O1l2
ΔH° = - 317.2 kJ 4 NH31g2 + O21g2 S 2 N2H41l2 + 2 H2O1l2
ΔH° = - 286.0 kJ
H2O1l2 ΔH°f = - 285.8 kJ>mol
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