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Edexcel A Level Chemistry

Mole Calculations

Mole calculations connect the symbolic equation to measurable quantities in the laboratory. These pages build from comparing masses and using the mole equation through to reacting mass calculations, percentage yield and atom economy.

Exam Paper
Paper 1
9CH0/01
Specification Points
5.3 – 5.14
7 points covered
Sub-topics
5 lessons
Revision notes available
Exam Board
Edexcel
Pearson 9CH0

Revision Notes

Relative mass
Comparing
Masses
Ar, Mr and formula mass
1

Comparing Masses of Substances

Revise relative atomic mass, relative formula mass and how chemists compare the masses of particles and compounds.

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Core equation
Mole
Equation
amount, mass and relative formula mass
2

Calculations involving Moles

Practise using amount of substance, mass and relative formula mass in the core mole calculation relationship.

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Balanced ratios
Reacting
Masses
moles, stoichiometry and balanced equations
3

Calculations using Reacting Masses

Use balanced equations and mole ratios to calculate the mass of reactants needed or products formed.

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Percentage
Yield
actual yield and theoretical yield
4

The Yield of a Reaction

Understand theoretical yield, actual yield and why percentage yield is often less than 100% in practical chemistry.

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Green chemistry
Atom
Economy
desired product and waste reduction
5

Atom Economy

Revise how atom economy measures the proportion of reactant atoms converted into the desired product.

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Summary map

Download, print and revise the key facts of this topic at a glance.

Summary map · PDF

Mole Calculations Map

Edexcel A Level Chemistry · Topic 5 Formulae, Equations and Amounts of Substance · Mole Calculations

The whole section on one A4 page: relative and molar masses, the mole and the Avogadro constant, reacting masses, yield, atom economy and formulae by experiment.

Download the map6 key ideas + an equations table · A4 portrait · print ready

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Specification Coverage

Mole Calculations – Edexcel A Level Chemistry

The following specification points outline the knowledge and skills students are expected to demonstrate for Topic 5. Ideas from this topic are applied across quantitative chemistry, practical work and later physical, inorganic and organic topics.

Chemical Language and Formulae

5.3
know that the molar mass of a substance is the mass per mole of the substance in g mol-1
5.5
be able to use experimental data to calculate empirical formulae and molecular formulae, including the use of pV = nRT for gases and volatile liquids.
i
empirical formulae
ii
molecular formulae including the use of pV = nRT for gases and volatile liquids
Calculations of empirical formula may involve composition by mass or percentage composition by mass data.

The Mole and Core Calculations

5.1
know that the mole, mol, is the unit for amount of a substance
5.2
be able to use the Avogadro constant, L, 6.02 × 1023 mol-1, in calculations
5.7
be able to calculate amounts of substances, in mol, in reactions involving mass, volume of gas, volume of solution and concentration. These calculations may involve reactants and/or products.
5.8
be able to calculate reacting masses from chemical equations, and vice versa, using the concepts of amount of substance and molar mass
5.14
be able to calculate percentage yields and percentage atom economies using chemical equations and experimental results.
Atom economy = molar mass of the desired product ÷ sum of the molar masses of all products × 100%