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(HT only) Explain that the mass of one mole of a substance in grams is numerically equal to its relative formula mass.

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Use of amount of substance in relation to masses of pure substances

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Moles (HT only)

Aqa Gcse ChemistryQuantitative chemistry

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(HT only) Explain that the mass of one mole of a substance in grams is numerically equal to its relative formula mass

This point belongs to Use of amount of substance in relation to masses of pure substances, especially Moles (HT only).
You need to be able to (HT only) Explain that the mass of one mole of a substance in grams is numerically equal to its relative formula mass.
The key ideas to know are mole, HT only, and relative formula mass.
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Key concepts

moleHT onlyrelative formula massmol

Why it matters

This objective helps connect Moles (HT only) to exam-style questions, flashcards, and revision notes for Use of amount of substance in relation to masses of pure substances.

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What should you know about (HT only) Explain that the mass of one mole of a substance in grams is numerically equal to its relative formula mass?

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In Chemistry, this page helps you answer questions about (HT only) Explain that the mass of one mole of a substance in grams is numerically equal to its relative formula mass within Use of amount of substance in relation to masses of pure substances. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are Mole and Relative Formula Mass.

Key terms

Mole: A unit of measurement for the amount of substance, defined as containing 6.02 x 10^23 particles.
Relative Formula Mass: The sum of the relative atomic masses of all atoms in a chemical formula, expressed in grams per mole.

Common trap

Confusing Mass and Moles: Remember that the mass of one mole of a substance in grams is equal to its relative formula mass. Always use the relative formula mass to convert between mass and moles.

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Question 1

What is the number of moles in 18 grams of water (H2O)?

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Related learning objectives

(HT only) State that chemical amounts are measured in moles.
Moles (HT only)
(HT only) State that the symbol for the unit mole is mol.
Moles (HT only)
(HT only) Explain that one mole of a substance contains the same number of stated particles as one mole of any other substance.
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(HT only) Define the Avogadro constant as the number of atoms, molecules or ions in one mole of a substance.
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(HT only) Use the value 6.02 x 10^23 per mole for the Avogadro constant.
Moles (HT only)