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Ch.5 - Thermochemistry
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 14th EditionCh.5 - Thermochemistry문제 79d
5장, 문제 79d

Ethanol (C2H5OH) is blended with gasoline as an automobile fuel. (d) Calculate the mass of CO2 produced per kJ of heat emitted.

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Identify the balanced chemical equation for the combustion of ethanol: \[ \text{C}_2\text{H}_5\text{OH} + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O} \]
Determine the standard enthalpy change (\( \Delta H^\circ \)) for the combustion of ethanol using standard enthalpies of formation.
Calculate the moles of \( \text{CO}_2 \) produced per mole of ethanol combusted from the balanced equation.
Use the \( \Delta H^\circ \) value to find the heat emitted per mole of ethanol combusted.
Calculate the mass of \( \text{CO}_2 \) produced per kJ of heat emitted by dividing the mass of \( \text{CO}_2 \) produced by the heat emitted.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Combustion Reaction

A combustion reaction is a chemical process in which a substance (usually a hydrocarbon) reacts with oxygen to produce carbon dioxide and water, releasing energy in the form of heat. In the case of ethanol, the reaction can be represented as C2H5OH + 3O2 → 2CO2 + 3H2O, illustrating how ethanol combusts to produce CO2 and H2O.
추천 영상:
가이드 코스
02:24
Combustion Apparatus

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced chemical equation. It allows us to determine the amount of CO2 produced from a given amount of ethanol burned, using mole ratios derived from the balanced equation to convert between moles of ethanol and moles of CO2.
추천 영상:
가이드 코스
01:16
Stoichiometry Concept

Energy Release in Combustion

The energy released during combustion is typically measured in kilojoules (kJ) and is derived from the breaking and forming of chemical bonds. The heat emitted per mole of ethanol can be calculated using its enthalpy of combustion, which indicates how much energy is released when a specific amount of ethanol is burned, allowing for the calculation of CO2 produced per kJ of heat.
추천 영상:
가이드 코스
02:24
Combustion Apparatus
관련 실천
교과서 질문

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교과서 질문

Ethanol (C2H5OH) is blended with gasoline as an automobile fuel. (b) Calculate the standard enthalpy change for the reaction, assuming H2O(g) as a product.

교과서 질문

Ethanol (C2H5OH) is blended with gasoline as an automobile fuel. (c) Calculate the heat produced per liter of ethanol by combustion of ethanol under constant pressure. Ethanol has a density of 0.789 g/mL.

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교과서 질문

Methanol (CH3OH) is used as a fuel in race cars. (d) Calculate the mass of CO2 produced per kJ of heat emitted.

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교과서 질문

Methanol (CH3OH) is used as a fuel in race cars. (b) Calculate the standard enthalpy change for the reaction, assuming H2O(g) as a product.

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교과서 질문

Diethyl ether, C4H10O(l), a flammable compound that was once used as a surgical anesthetic, has the structure The complete combustion of 1 mol of C4H10O(l) to CO2(g) and H2O(l) yields ΔH° = -2723.7 kJ. (a) Write a balanced equation for the combustion of 1 mol of C4H10O(l).

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