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Ch.5 - Thermochemistry
Brown - Chemistry: The Central Science 15th Edition
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 15th EditionCh.5 - Thermochemistry문제 74
5장, 문제 74

Many portable gas heaters and grills use propane, C3H8(g), as a fuel. Using standard enthalpies of formation, calculate the quantity of heat produced when 10.0 g of propane is completely combusted in air under standard conditions.

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Identify the balanced chemical equation for the combustion of propane: \( \text{C}_3\text{H}_8(g) + 5\text{O}_2(g) \rightarrow 3\text{CO}_2(g) + 4\text{H}_2\text{O}(l) \).
Determine the standard enthalpies of formation (\( \Delta H_f^\circ \)) for each substance involved in the reaction: \( \text{C}_3\text{H}_8(g) \), \( \text{O}_2(g) \), \( \text{CO}_2(g) \), and \( \text{H}_2\text{O}(l) \).
Use the formula for the standard enthalpy change of the reaction: \( \Delta H_{rxn}^\circ = \sum \Delta H_f^\circ (\text{products}) - \sum \Delta H_f^\circ (\text{reactants}) \).
Calculate the moles of propane in 10.0 g using its molar mass: \( \text{moles of } \text{C}_3\text{H}_8 = \frac{10.0 \text{ g}}{\text{molar mass of } \text{C}_3\text{H}_8} \).
Multiply the moles of propane by the \( \Delta H_{rxn}^\circ \) to find the total heat produced during the combustion.

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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 reacts rapidly with oxygen, producing heat and light. In the case of propane (C3H8), the combustion reaction involves its reaction with oxygen to produce carbon dioxide and water. Understanding this reaction is crucial for calculating the heat released during combustion.
추천 영상:
가이드 코스
02:24
Combustion Apparatus

Standard Enthalpy of Formation

The standard enthalpy of formation (ΔHf°) is the change in enthalpy when one mole of a compound is formed from its elements in their standard states. This value is essential for calculating the heat produced in a reaction, as it allows us to determine the total energy change by using the enthalpies of the reactants and products involved in the combustion of propane.
추천 영상:
가이드 코스
02:34
Enthalpy of Formation

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced chemical equation. It is vital for determining the amount of heat produced from a specific mass of propane, as it allows us to convert grams of propane to moles and relate it to the heat released using the standard enthalpy of combustion.
추천 영상:
가이드 코스
01:16
Stoichiometry Concept
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