Question detail
Calculate the number of moles in 18 grams 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. 1 mol
- B. 0.5 mol
- C. 2 mol
- D. 3 mol
Answer
1 mol
Explanation
The relative formula mass of water (H2O) is 18 g/mol. Therefore, 18 g of water corresponds to 1 mol.
Common mistake
Confusing Avogadro's Constant
Students often confuse the Avogadro constant with the number of particles in a specific mass of a substance instead of understanding it as a fixed number of particles in one mole.
Remember that Avogadro's constant (6.02 x 10^23) represents the number of atoms, molecules, or ions in one mole of any substance, regardless of its mass.
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