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#### Overview: Amount of Substance

This is an overview of Topic 3: Amount of a Substance. It includes ionic equations and many typical calculations such as calculations involving ideal gas equation, number of moles, Avogadro’s constant and more.

#### The Mole

This video outlines how scientists devised the concept of the mole and the importance of the mass of an atom of carbon-12.

#### Moles and Avogadro’s Number

This video outlines the relation between moles and avogadro’s number and how to approach questions asking many moles/particles are present.

#### Empirical and Molecular Formula

This video explains what empirical formula is and how to differs from molecular formula and provides examples of calculation involving empirical formula.

#### Hydrated Salts and Water of Crystallisation

The video outlines what water of crystallisation is and goes through typical calculation questions to work out the water of crystallisation.

#### Moles and Gases

This video explains the link between volume of a gas and number of moles and provides sine examples calculation type questions.

#### Reacting Amount Calculations: Volumes of Gases

This videos goes through typical calculations question involving volumes of gases.

#### The Ideal Gas Equation 1

This video explains why the ideal gas equation is needed and it outlines the terms and units with a simple calculation.

#### The Ideal Gas Equation 2

The video going through more difficult ideal gas equation calculation questions.

#### Reacting Amount Calculations: Masses

This video outlines the link between molecular formula, mass and moles of a substance and goes through typical calculation questions.

#### Moles and Solutions

This video outlines the links between concentration, moles and volume and then provides example calculation questions working out concentrations of solutions.

#### More Moles and Solutions

This video contains more difficult concentration calculation questions.

#### Reacting Amount Calculations: Solutions

This video explains how to handle titration calculation type questions involving concentration of solutions.

#### Reacting Amount Calculations: Using all the Formula Triangles

This video explains how to do more difficult reacting amount calculations combining all the knowledge of different formulas.

#### Percentage Yield & Limiting Reagent

This video explains how to calculate percentage yield of a reaction using both the moles and mass method and how to determine the limiting reagent using the starting masses of both reagents.

#### Atom Economy

This video explains how to calculate atom economy and its importance especially in industrial processes. This is then followed with examples of reaction types and opportunity to work out the atom economy of the particular reaction.