Learning objective
Use balanced equations to calculate reacting masses.
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
Balanced equations and reacting quantities
Study support
Understand this objective
Quick explanation
Use balanced equations to calculate reacting masses
- This point belongs to Amount of substance, especially Balanced equations and reacting quantities.
- You need to be able to use balanced equations to calculate reacting masses.
- The key ideas to know are reacting mass and balanced equation.
- 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 Balanced equations and reacting quantities to exam-style questions, flashcards, and revision notes for Amount of substance.
Quick student answer
In the combustion of methane, how many moles of O₂ are required to react with one mole of CH₄?
Direct answer
2.0
Key terms
- Mole: The amount of substance that contains 6.022×10²³ elementary entities and is used to relate mass to number of particles.
- Limiting reactant: The reactant that determines the maximum amount of product that can be formed because it is used up first.
Common trap
Skipping equation balancing: Always balance the chemical equation before performing any mole or mass calculations to ensure atom conservation.
Related questions
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Flashcard prompts
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Revision tools
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Revision notestopic notes
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Open revision notesRelated learning objectives
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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