Question detail
Case 47 formula-choice. A student starts a worked solution. Which first step is most appropriate? Focus on yield the amount product obtained reaction in Percentage yield, not on a neighbouring Unit 4.3 idea.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Yield and atom economy of chemical reactions (chemistry only)
Question
- A. Case 47 formula-choice: Use the named relationship before substituting numbers for yield the amount product obtained reaction
- B. Case 47 formula-choice: Start with a memorised answer and add a unit later (Percentage yield)
- C. Case 47 formula-choice: Change every number into a percentage before choosing a formula (yield the amount product obtained reaction)
- D. Case 47 formula-choice: Use a nearby formula from a different quantitative chemistry subtopic (Yield and atom economy of chemical reactions (chemistry only))
Answer
The correct option is Case 47 formula-choice: Use the named relationship before substituting numbers for yield the amount product obtained reaction.
Explanation
The correct option is Case 47 formula-choice: Use the named relationship before substituting numbers for yield the amount product obtained reaction. It supports the approved learning objective by keeping the method tied to yield the amount product obtained reaction in Percentage yield. The other options are incorrect because they either use the wrong quantitative relationship, lose the required unit, confuse coefficients with subscripts, or report an answer without a complete worked method.
Common mistake
Confusing Yield Definition
Students often confuse yield with the theoretical yield, thinking it refers to the maximum possible amount of product rather than the actual amount obtained.
Clarify that yield specifically refers to the actual amount of product obtained from a reaction, not the theoretical maximum.
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