Chemical calculations are essential skills that help you work out...
Chemistry111 views·Updated 20 Jul 2026·2 pagesNat5 Chemistry - Mastering Calculations
Olivia Churcher@oliviachurcher
1
of 2
Basic Chemical Calculations
Working out formula mass is your starting point for most chemistry calculations. You'll need to add up the mass of every single atom in a chemical formula - sounds tricky, but it's just careful addition once you know the steps.
Start by writing down the formula (usually given in exam questions), then count how many atoms of each element you've got. Use your data booklet to find the relative atomic mass (RAM) for each element, then multiply and add everything together.
Percentage composition tells you what fraction of a compound is made up of one particular element. Calculate the total mass first, work out how much mass comes from your specific element, then convert to a percentage using the formula: % by mass = (mass of element ÷ total mass) × 100.
Quick Tip: Always double-check your atom counting - it's the most common mistake that trips students up in formula mass calculations.
2
of 2
Moles and Concentration
Moles are chemistry's way of counting particles, and they're connected to mass through the gram formula mass (GFM). Think of moles as a bridge between the tiny atomic world and the masses you can actually measure in the lab.
The key relationship you need to master is: moles = mass ÷ GFM. This triangle relationship means you can rearrange to find any of these three values if you know the other two.
Concentration measures how much substance is dissolved in a given volume of solution. It's usually measured in mol/L and connects moles, concentration, and volume together in another essential relationship.
Remember: These formulas work like puzzle pieces - once you identify what you're given and what you need to find, the calculation method becomes clear.
We thought you’d never ask...
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Chemical Calculations
9ChemistryGCSE Chemistry Revision Essentials
Comprehensive overview of key GCSE Chemistry topics including atomic structure, chemical bonding, reaction kinetics, and the periodic table. Ideal for Higher Tier students preparing for exams. Key concepts include mole calculations, electrolysis, and the Haber process.
92,98287
ChemistryChemistry in Society Overview
Explore key concepts in Higher Chemistry with this comprehensive overview covering percentage yield, atom economy, redox reactions, and titration techniques. Ideal for students preparing for exams, this resource provides essential calculations and examples to enhance understanding of chemical processes in society.
S452610
ChemistryAcids & Bases Overview
Explore the fundamentals of acids and bases, including neutralization reactions, pH scale, titration techniques, and calculations for molarity. This comprehensive guide covers key concepts such as naming salts, indicators, and practical applications in everyday life.
S31,28544
ChemistryLimiting Reactants & Yield
Explore key concepts in quantitative chemistry, including limiting reactants, conservation of mass, mole calculations, and percentage yield. This summary covers essential formulas and examples to help you understand stoichiometry and improve your exam performance. Ideal for GCSE AQA students.
92,28557
ChemistryNat 5 chem unit 1
All national 5 information needed for chemistry
S434910
ChemistryMole Calculations & Concepts
Explore essential calculations and concepts related to moles in chemistry. This summary covers molar mass, concentration, ideal gas equations, empirical and molecular formulas, and the significance of atom economy in chemical processes. Ideal for A-Level Chemistry students seeking to master the topic of 'Amount of Substance'.
121463
ChemistryMole and Concentration Calculations
Explore essential chemistry calculations involving moles, mass, concentration, and volume. This summary covers key concepts such as molar mass, stoichiometry, and mole conversions, providing a clear understanding of how to calculate the amounts of substances in chemical reactions. Ideal for students preparing for exams or needing a quick reference.
91725
ChemistryChemical Calculations Overview
Explore key concepts in chemical calculations, including moles, molarity, balancing equations, and yield. This summary covers essential topics such as relative atomic mass, stoichiometry, acid-base titrations, and atom economy, providing a comprehensive understanding for AQA GCSE Chemistry students.
1186326
ChemistryMole Calculations & Titration
Explore essential mole calculations and stoichiometry concepts for A-Level Chemistry. This study resource covers the amount of substance, back titration methods, and detailed examples to enhance your understanding of chemical calculations. Perfect for exam preparation and mastering key concepts.
123225
Most popular content in Chemistry
9G
ChemistryGCSE AQA Chemistry Topic 1- The Atom
The Atom
101,2910
Chemistrychem paper 1
higher
112,10444
ChemistryA-level OCR A Chemistry summary sheets
Everything from snaprevise for OCR chemistry a-level
122,32379
C
Chemistrychem paper 1
Unlock the secrets of chemical reactions with this comprehensive flashcard set designed to help you conquer complex concepts and ace your Chemistry exams.
117261
ChemistryChemistry paper 2
Chem paper 2 notes
1172714
A
ChemistryAQA GCSE Chemistry 4.4 Chemical changes
4.4 Reactions of acids with bases or carbonates
97621
ChemistryEssential Chemistry Practicals
Explore key AQA GCSE Chemistry practicals, including flame tests, titration, and gas identification. This resource covers essential techniques for analyzing ions, making salts, and understanding reaction kinetics. Perfect for students preparing for exams and practical assessments.
1011,973902
A
ChemistryAtomic Mass and Atomic Number Calculations
Calculate the number of protons, neutrons, and electrons for different elements and isotopes.
S34950
F
ChemistryFundamentals of Atomic Structure
Practice identifying subatomic particles, calculating neutrons, and defining isotopes and atomic/mass numbers.
123460
Most popular content
9
SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12102,9583,041
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,7532,307
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8941,060
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,6691,400
C
BiologyCell Biology and Cell structure
cell structures
93,2810
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,176125
SociologySociological Theories Overview
Comprehensive revision of key sociological theories including Functionalism, Marxism, Feminism, and Interpretivism. Explore concepts like value freedom, identity formation, and the critique of social control. Ideal for AQA A-Level Sociology students preparing for exams. This summary covers essential theories and their implications in sociology, providing a clear understanding of each perspective.
1231,480846
T
BiologyThe functions of subcellular structures - B1 Biology
Flashcards on the different functions of subcellular structures: cell membrane, nucleus, mitochondria, ribosomes, cytoplasm, permant vacuole, chloroplasts and cell wall.
102,8215
1
Biology1.cells Gcse biology question cards
combined science higher biology
92,3644
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user
Chemistry111 views·Updated 20 Jul 2026·2 pagesNat5 Chemistry - Mastering Calculations
Olivia Churcher@oliviachurcher
Chemical calculations are essential skills that help you work out exactly how much of each substance you're dealing with in reactions. These fundamental maths tools will help you ace your chemistry exams and understand what's actually happening in chemical processes.
1
of 2
Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Basic Chemical Calculations
Working out formula mass is your starting point for most chemistry calculations. You'll need to add up the mass of every single atom in a chemical formula - sounds tricky, but it's just careful addition once you know the steps.
Start by writing down the formula (usually given in exam questions), then count how many atoms of each element you've got. Use your data booklet to find the relative atomic mass (RAM) for each element, then multiply and add everything together.
Percentage composition tells you what fraction of a compound is made up of one particular element. Calculate the total mass first, work out how much mass comes from your specific element, then convert to a percentage using the formula: % by mass = (mass of element ÷ total mass) × 100.
Quick Tip: Always double-check your atom counting - it's the most common mistake that trips students up in formula mass calculations.
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Moles and Concentration
Moles are chemistry's way of counting particles, and they're connected to mass through the gram formula mass (GFM). Think of moles as a bridge between the tiny atomic world and the masses you can actually measure in the lab.
The key relationship you need to master is: moles = mass ÷ GFM. This triangle relationship means you can rearrange to find any of these three values if you know the other two.
Concentration measures how much substance is dissolved in a given volume of solution. It's usually measured in mol/L and connects moles, concentration, and volume together in another essential relationship.
Remember: These formulas work like puzzle pieces - once you identify what you're given and what you need to find, the calculation method becomes clear.
We thought you’d never ask...
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Chemical Calculations
9ChemistryGCSE Chemistry Revision Essentials
Comprehensive overview of key GCSE Chemistry topics including atomic structure, chemical bonding, reaction kinetics, and the periodic table. Ideal for Higher Tier students preparing for exams. Key concepts include mole calculations, electrolysis, and the Haber process.
92,98287
ChemistryChemistry in Society Overview
Explore key concepts in Higher Chemistry with this comprehensive overview covering percentage yield, atom economy, redox reactions, and titration techniques. Ideal for students preparing for exams, this resource provides essential calculations and examples to enhance understanding of chemical processes in society.
S452610
ChemistryAcids & Bases Overview
Explore the fundamentals of acids and bases, including neutralization reactions, pH scale, titration techniques, and calculations for molarity. This comprehensive guide covers key concepts such as naming salts, indicators, and practical applications in everyday life.
S31,28544
ChemistryLimiting Reactants & Yield
Explore key concepts in quantitative chemistry, including limiting reactants, conservation of mass, mole calculations, and percentage yield. This summary covers essential formulas and examples to help you understand stoichiometry and improve your exam performance. Ideal for GCSE AQA students.
92,28557
ChemistryNat 5 chem unit 1
All national 5 information needed for chemistry
S434910
ChemistryMole Calculations & Concepts
Explore essential calculations and concepts related to moles in chemistry. This summary covers molar mass, concentration, ideal gas equations, empirical and molecular formulas, and the significance of atom economy in chemical processes. Ideal for A-Level Chemistry students seeking to master the topic of 'Amount of Substance'.
121463
ChemistryMole and Concentration Calculations
Explore essential chemistry calculations involving moles, mass, concentration, and volume. This summary covers key concepts such as molar mass, stoichiometry, and mole conversions, providing a clear understanding of how to calculate the amounts of substances in chemical reactions. Ideal for students preparing for exams or needing a quick reference.
91725
ChemistryChemical Calculations Overview
Explore key concepts in chemical calculations, including moles, molarity, balancing equations, and yield. This summary covers essential topics such as relative atomic mass, stoichiometry, acid-base titrations, and atom economy, providing a comprehensive understanding for AQA GCSE Chemistry students.
1186326
ChemistryMole Calculations & Titration
Explore essential mole calculations and stoichiometry concepts for A-Level Chemistry. This study resource covers the amount of substance, back titration methods, and detailed examples to enhance your understanding of chemical calculations. Perfect for exam preparation and mastering key concepts.
123225
Most popular content in Chemistry
9G
ChemistryGCSE AQA Chemistry Topic 1- The Atom
The Atom
101,2910
Chemistrychem paper 1
higher
112,10444
ChemistryA-level OCR A Chemistry summary sheets
Everything from snaprevise for OCR chemistry a-level
122,32379
C
Chemistrychem paper 1
Unlock the secrets of chemical reactions with this comprehensive flashcard set designed to help you conquer complex concepts and ace your Chemistry exams.
117261
ChemistryChemistry paper 2
Chem paper 2 notes
1172714
A
ChemistryAQA GCSE Chemistry 4.4 Chemical changes
4.4 Reactions of acids with bases or carbonates
97621
ChemistryEssential Chemistry Practicals
Explore key AQA GCSE Chemistry practicals, including flame tests, titration, and gas identification. This resource covers essential techniques for analyzing ions, making salts, and understanding reaction kinetics. Perfect for students preparing for exams and practical assessments.
1011,973902
A
ChemistryAtomic Mass and Atomic Number Calculations
Calculate the number of protons, neutrons, and electrons for different elements and isotopes.
S34950
F
ChemistryFundamentals of Atomic Structure
Practice identifying subatomic particles, calculating neutrons, and defining isotopes and atomic/mass numbers.
123460
Most popular content
9SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12102,9583,041
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,7532,307
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8941,060
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,6691,400
C
BiologyCell Biology and Cell structure
cell structures
93,2810
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,176125
SociologySociological Theories Overview
Comprehensive revision of key sociological theories including Functionalism, Marxism, Feminism, and Interpretivism. Explore concepts like value freedom, identity formation, and the critique of social control. Ideal for AQA A-Level Sociology students preparing for exams. This summary covers essential theories and their implications in sociology, providing a clear understanding of each perspective.
1231,480846
T
BiologyThe functions of subcellular structures - B1 Biology
Flashcards on the different functions of subcellular structures: cell membrane, nucleus, mitochondria, ribosomes, cytoplasm, permant vacuole, chloroplasts and cell wall.
102,8215
1
Biology1.cells Gcse biology question cards
combined science higher biology
92,3644
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user