Learning objective
Define relative molecular mass in relation to carbon-12.
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Topic
Amount of substance
Subtopic
Relative atomic mass and relative molecular mass
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Quick explanation
Define relative molecular mass in relation to carbon-12
- This point belongs to Amount of substance, especially Relative atomic mass and relative molecular mass.
- You need to be able to define relative molecular mass in relation to carbon-12.
- The key ideas to know are relative molecular mass, Ar, and carbon-12.
- 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 Relative atomic mass and relative molecular mass to exam-style questions, flashcards, and revision notes for Amount of substance.
Quick student answer
What is the relative molecular mass (Mr) of a molecule defined in relation to?
Direct answer
Relative molecular mass is defined in relation to carbon-12.
Key terms
- Relative atomic mass: The weighted average mass of an atom of an element compared to 1/12th the mass of a carbon-12 atom.
- Relative molecular mass: The mass of a molecule compared to 1/12th the mass of a carbon-12 atom.
Common trap
Confusing relative atomic mass with relative molecular mass: Remember that relative atomic mass refers to individual atoms, while relative molecular mass refers to molecules.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Define relative atomic 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
- Apply the mole to electrons, atoms, molecules, ions, formula units and equations.
The mole and the Avogadro constant