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Ch.7 - Thermochemistry
Tro - Chemistry: A Molecular Approach 5th Edition
Tro5th EditionChemistry: A Molecular ApproachISBN: 9780134874371당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tro 5th EditionCh.7 - Thermochemistry문제 62
7장, 문제 62

Titanium reacts with iodine to form titanium(III) iodide, emitting heat. 2 Ti(s) + 3 I2(g) → 2 TiI3(s) ΔH°rxn = –839 kJ Determine the mass of titanium that react if 1.55×103 kJ of heat is emitted by the reaction.

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1
Write down the balanced chemical equation for the reaction: \(2 \text{Ti}(s) + 3 \text{I}_2(g) \rightarrow 2 \text{TiI}_3(s)\).
Identify the heat of reaction (\(\Delta H_{\text{rxn}}\)) from the equation, which is -839 kJ. This indicates that 839 kJ of heat is released when 2 moles of titanium react.
Calculate the number of moles of titanium that would react to release 1.55 \(\times\) 10^3 kJ of heat. Use the proportion: \(\frac{839 \text{ kJ}}{2 \text{ moles of Ti}} = \frac{1.55 \times 10^3 \text{ kJ}}{x \text{ moles of Ti}}\).
Solve for \(x\), the moles of titanium, using the proportion set up in the previous step.
Convert the moles of titanium to mass using the molar mass of titanium (approximately 47.87 g/mol). Multiply the moles of titanium by the molar mass to find the mass in grams.

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주요 개념

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

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions. It involves using balanced chemical equations to determine the relationships between the amounts of substances consumed and produced. In this case, stoichiometry will help relate the heat emitted to the amount of titanium that reacts.
추천 영상:
가이드 코스
01:16
Stoichiometry Concept

Enthalpy Change (ΔH)

Enthalpy change (ΔH) is a measure of the heat absorbed or released during a chemical reaction at constant pressure. A negative ΔH indicates that the reaction is exothermic, meaning it releases heat. In this question, the ΔH of -839 kJ indicates that for every 2 moles of titanium that react, 839 kJ of heat is emitted.
추천 영상:
가이드 코스
02:34
Enthalpy of Formation

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is essential for converting between moles and grams in stoichiometric calculations. For titanium, the molar mass is approximately 47.87 g/mol, which will be used to find the mass of titanium that corresponds to the heat emitted in the reaction.
추천 영상:
가이드 코스
02:11
Molar Mass Concept
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