Question detail
In Moles (HT only), which option best answers variant 5 of this quantitative chemistry objective: (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
- A. formula and unit: (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance
- B. wrong formula: uses a different Unit 4.3 relationship from Moles (HT only)
- C. wrong unit: gives a value without checking the required unit
- D. wrong reasoning: confuses coefficients, subscripts, mass, moles, or concentration
Answer
The correct option is formula and unit: (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance.
Explanation
The correct option is formula and unit: (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance. It is correct because it directly supports the approved learning objective to (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance. This belongs to Moles (HT only) within Use of amount of substance in relation to masses of pure substances, so the answer must use the named Unit 4.3 relationship and avoid mixing it with nearby ideas such as mass, moles, concentration, yield, atom economy, gas volume, coefficients, or subscripts.
Common mistake
Confusing Moles and Mass
Students often confuse the number of moles with the mass of a substance, leading to incorrect calculations.
Remember that to find mass, you need to multiply the number of moles by the relative formula mass. Use the formula: mass = moles × relative formula mass.
Related flashcards
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Related practice questions
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