Learning objective
Define relative atomic 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 atomic 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 atomic mass in relation to carbon-12.
- The key ideas to know are carbon-12, relative atomic mass, and Ar.
- 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
Which statement best defines the relative atomic mass of an element?
Direct answer
The mass of one atom of the element relative to the mass of one atom of carbon‑12.
Key terms
- Relative atomic mass: The mass of one atom of an element expressed in atomic mass units (u), defined relative to the mass of a carbon‑12 atom.
- Isotopic mass: The mass of a specific isotope of an element, measured in atomic mass units.
Common trap
Confusing relative atomic mass with atomic weight: Remember that relative atomic mass is a weighted average of isotopic masses and is usually expressed to two or more decimal places.
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Open revision notesRelated learning objectives
- 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
- Apply the mole to electrons, atoms, molecules, ions, formula units and equations.
The mole and the Avogadro constant