Question detail
If you have 0.75 moles of a gas, how many molecules are present? Use the Avogadro constant in your calculation.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
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exam_style
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Topic
Amount of substance
Question
If you have 0.75 moles of a gas, how many molecules are present? Use the Avogadro constant in your calculation.
Answer
The number of molecules in 0.75 moles is 4.51 x 10^23 molecules. This answer is anchored to The mole and the Avogadro constant. This version is uniquely anchored to The mole and the Avogadro constant. Retrieval anchor: A-level cue c549a3e1.
Explanation
The number of molecules in 0.75 moles is 4.51 x 10^23 molecules. This answer is anchored to The mole and the Avogadro constant. is correct because it supports the objective: Explain the Avogadro constant as the number of particles in one mole.. The reasoning stays within The mole and the Avogadro constant and avoids drifting into a similar A-Level Chemistry idea. This item is treated as conceptual revision rather than a formal calculation item because the validated answer is an explanation or option choice, not a worked numerical response.
Common mistake
Misunderstanding the Avogadro Constant
Students often confuse the Avogadro constant with the number of moles instead of recognizing it as the number of particles in one mole.
To clarify, remember that the Avogadro constant (6.022 x 10^23) represents the number of atoms, molecules, or ions in one mole of a substance. When calculating the number of particles, use the formula: number of particles = moles × Avogadro constant. For example, if you have 2 moles of a substance, the calculation would be: 2 moles × 6.022 x 10^23 particles/mole = 1.2044 x 10^24 particles.
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