Learning objective
Calculate relative molecular or formula mass from a chemical formula and relative atomic masses.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Amount of substance
Subtopic
Relative atomic mass and relative molecular mass
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Quick explanation
Calculate relative molecular or formula mass from a chemical formula and relative atomic masses
- This point belongs to Amount of substance, especially Relative atomic mass and relative molecular mass.
- You need to be able to calculate relative molecular or formula mass from a chemical formula and relative atomic masses.
- The key ideas to know are Ar and relative atomic mass.
- 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 of glucose (C₆H₁₂O₆)?
Direct answer
180.16
Key terms
- Relative atomic mass: The weighted average mass of the naturally occurring isotopes of an element, expressed in atomic mass units (u).
- Relative molecular mass: The sum of the relative atomic masses of all atoms in a molecule, expressed in atomic mass units (u).
Common trap
Using rounded atomic masses: Always use the most precise values provided in the periodic table (e.g., H = 1.008 u).
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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
- 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
- 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