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Ch.3 - Mass Relationships in Chemical Reactions
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145당신이 사용하는 게 아니라요?교과서 변경
모든 교과서McMurry 8th EditionCh.3 - Mass Relationships in Chemical Reactions문제 7
3장, 문제 7

If 42.85 grams of salicylic acid reacts with excess acetic anhydride and produces 48.47 grams of aspirin, what is the percent yield of the reaction? (LO 3.6) (a) 88.40% (b) 64.69% (c) 86.72% (d) 78.74%

검증된 단계별 안내
1
Identify the balanced chemical equation for the reaction: \( \text{C}_7\text{H}_6\text{O}_3 + \text{C}_4\text{H}_6\text{O}_3 \rightarrow \text{C}_9\text{H}_8\text{O}_4 + \text{C}_2\text{H}_4\text{O}_2 \).
Calculate the molar mass of salicylic acid (\( \text{C}_7\text{H}_6\text{O}_3 \)) and aspirin (\( \text{C}_9\text{H}_8\text{O}_4 \)).
Determine the moles of salicylic acid used by dividing the given mass (42.85 grams) by its molar mass.
Use the stoichiometry of the balanced equation to find the theoretical yield of aspirin in grams.
Calculate the percent yield using the formula: \( \text{Percent Yield} = \left( \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \right) \times 100\% \), where the actual yield is 48.47 grams.

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주요 개념

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

Percent Yield

Percent yield is a measure of the efficiency of a chemical reaction, calculated by comparing the actual yield of a product to the theoretical yield. It is expressed as a percentage and is determined using the formula: (actual yield / theoretical yield) × 100. A high percent yield indicates that the reaction proceeded effectively, while a low percent yield may suggest incomplete reactions or side reactions.
추천 영상:
가이드 코스
03:09
Percent Yield in Reactions

Stoichiometry

Stoichiometry involves the calculation of reactants and products in chemical reactions based on the balanced chemical equation. It allows chemists to predict the amounts of substances consumed and produced in a reaction. Understanding stoichiometry is essential for determining the theoretical yield, which is the maximum amount of product that can be formed from given amounts of reactants.
추천 영상:
가이드 코스
01:16
Stoichiometry Concept

Limiting Reactant

The limiting reactant is the substance that is completely consumed first in a chemical reaction, thus determining the maximum amount of product that can be formed. Identifying the limiting reactant is crucial for calculating the theoretical yield, as it dictates how much of the product can be produced based on the initial quantities of reactants. In this case, salicylic acid is the limiting reactant since it reacts with excess acetic anhydride.
추천 영상:
가이드 코스
01:30
Limiting Reagent Concept
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