Learning objective
Apply the mole to electrons, atoms, molecules, ions, formula units and equations.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Flashcards
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Questions
Topic
Amount of substance
Subtopic
The mole and the Avogadro constant
Study support
Understand this objective
Quick explanation
Apply the mole to electrons, atoms, molecules, ions, formula units and equations
- This point belongs to Amount of substance, especially The mole and the Avogadro constant.
- You need to be able to apply the mole to electrons, atoms, molecules, ions, formula units and equations.
- The key ideas to know are mole.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect The mole and the Avogadro constant to exam-style questions, flashcards, and revision notes for Amount of substance.
Quick student answer
Which of the following best describes Avogadro’s constant?
Direct answer
The number of molecules in 1 mol of any substance
Key terms
- Avogadro’s constant: The number of entities (atoms, molecules, ions, or formula units) in one mole of a substance, equal to 6.022 × 10²³ mol⁻¹.
- Formula unit: The smallest repeating unit in an ionic compound that represents the stoichiometry of the compound, e.g., NaCl.
Common trap
Misinterpreting Avogadro’s constant: Avogadro’s constant is the number of entities in 1 mol, not 1 g. Always use the molar mass to convert between mass and moles before applying Avogadro’s constant.
Related questions
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Flashcard prompts
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Revision tools
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Revision notestopic notes
Open the full topic revision notes when you are ready to review this objective in context.
Open revision notesRelated learning objectives
- Define relative atomic mass in relation to carbon-12.
Relative atomic mass and relative molecular mass
- Define relative molecular mass in relation to carbon-12.
Relative atomic mass and relative molecular mass
- Use relative formula mass for ionic compounds.
Relative atomic mass and relative molecular mass
- Calculate relative molecular or formula mass from a chemical formula and relative atomic masses.
Relative atomic mass and relative molecular mass
- Explain the Avogadro constant as the number of particles in one mole.
The mole and the Avogadro constant