# Amount of Substance Videos

The videos below are from the YouTube channels MaChemGuy and Mr C Dunkley. Subscribe to keep up to date with the latest videos.

#### 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.

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.