Question detail
Calculate the number of moles in 50 g of water (H2O).
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. 2.78 mol
- B. 2.78
- C. 2.50 mol
- D. 2.50
Answer
2.78 mol
Explanation
The relative formula mass of water (H2O) is 18 g/mol. Using the formula moles = mass / Mr, we find that 50 g of water corresponds to approximately 2.78 moles.
Common mistake
Confusing moles with mass
Students often confuse the concept of moles with mass, thinking that mass is the same as the amount of substance.
Remember that moles measure the amount of substance, while mass is measured in grams. Use the relationship between mass and moles to clarify this distinction.
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