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Ch.9 - Thermochemistry: Chemical Energy
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145당신이 사용하는 게 아니라요?교과서 변경
모든 교과서McMurry 8th EditionCh.9 - Thermochemistry: Chemical Energy문제 116b
9장, 문제 116b

Use the data in Appendix B to find standard enthalpies of reaction in kilojoules for the following processes: (b) 2 H2O2 (aq) → 2 H2O (l) + O2(g)

검증된 단계별 안내
1
insert step 1: Identify the standard enthalpy of formation (ΔH_f^°) for each substance involved in the reaction from Appendix B.
insert step 2: Write the balanced chemical equation for the reaction: 2 H2O2 (aq) → 2 H2O (l) + O2(g).
insert step 3: Use the formula for the standard enthalpy change of the reaction: ΔH_rxn^° = Σ ΔH_f^°(products) - Σ ΔH_f^°(reactants).
insert step 4: Calculate the sum of the standard enthalpies of formation for the products: 2 * ΔH_f^°(H2O (l)) + 1 * ΔH_f^°(O2(g)).
insert step 5: Calculate the sum of the standard enthalpies of formation for the reactants: 2 * ΔH_f^°(H2O2 (aq)).

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주요 개념

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Standard Enthalpy of Reaction

The standard enthalpy of reaction (ΔH°) is the heat change that occurs when a reaction takes place under standard conditions (1 atm pressure and a specified temperature, usually 25°C). It is a crucial concept in thermodynamics, allowing chemists to predict whether a reaction is exothermic (releases heat) or endothermic (absorbs heat). This value can be calculated using Hess's law or from standard enthalpies of formation.
추천 영상:
가이드 코스
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 chemists to calculate the enthalpy change for complex reactions by breaking them down into simpler steps for which enthalpy values are known. It is particularly useful when direct measurement of ΔH is difficult.
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가이드 코스
02:03
Hess's Law

Enthalpy of Formation

The enthalpy of formation (ΔHf°) is the change in enthalpy when one mole of a compound is formed from its elements in their standard states. These values are tabulated for many substances and are essential for calculating the standard enthalpy of reaction using the formula: ΔH° = ΣΔHf°(products) - ΣΔHf°(reactants). Understanding this concept is vital for determining the energy changes associated with chemical reactions.
추천 영상:
가이드 코스
02:34
Enthalpy of Formation
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