Stoichiometry and the Mole: Free Course

About this course

Study Stoichiometry and the Mole in this free English video course from Khan Academy. The classroom preserves all 7 published source recordings, totaling approximately 1h 11m, with their original lesson titles and sequence. The selected curriculum focuses on chemical representations, relationships and worked reasoning. Use the videos to follow an explanation, examine an example and develop a study output you can check independently. The course title describes this recorded subject or learning track; your study can extend beyond watching through the practical activities below.

Course at a glance

What you’ll learn

• Follow the explanation and worked reasoning in “Calculations using Avogadro's number (part 1)”, then describe the main idea in your own words.
• Follow the explanation and worked reasoning in “Worked example: Calculating molar mass and number of moles”, then describe the main idea in your own words.
• Follow the explanation and worked reasoning in “Empirical, molecular, and structural formulas”, then describe the main idea in your own words.
• Follow the explanation and worked reasoning in “Calculations using Avogadro's number (part 2)”, then describe the main idea in your own words.
• Connect examples across Stoichiometry and the Mole by identifying the terms, assumptions and methods they use.
• Create a small independent practice output and check it against the relevant teaching explanation.

Skills you’ll gain

• Chemical reasoning
• Units and notation
• Molecular concepts
• Worked examples

Course Overview

The source curriculum is presented as a complete recorded video edition of Stoichiometry and the Mole. Representative lessons include “Calculations using Avogadro's number (part 1)”, “Empirical, molecular, and structural formulas” and “Stoichiometry: mass-to-mass and limiting reagent”. These recordings give concrete examples to revisit while building chemical representations, relationships and worked reasoning. Their place in the lesson list is preserved, so you can return to a particular explanation without losing its source position. Introductions, demonstrations, examples, reviews and compilations remain included whenever they appear in the original playlist. Reading a lesson title is useful for locating a topic; working through its reasoning and checking a practice attempt is what makes the recording valuable for learning.

How to study the course

• Videos 1–1: this part of the source list includes “Calculations using Avogadro's number (part 1)” through “Calculations using Avogadro's number (part 1)”. Define the particles, quantities and conditions. Keep a brief working note, revisit an unclear explanation and test one example before moving to another part of the material.
• Videos 2–3: this part of the source list includes “Worked example: Calculating molar mass and number of moles” through “Empirical, molecular, and structural formulas”. Use symbols and units consistently. Keep a brief working note, revisit an unclear explanation and test one example before moving to another part of the material.
• Videos 4–5: this part of the source list includes “Worked example: Calculating mass percent” through “Calculations using Avogadro's number (part 2)”. Connect a representation to its chemical meaning. Keep a brief working note, revisit an unclear explanation and test one example before moving to another part of the material.
• Videos 6–7: this part of the source list includes “Stoichiometry: mole-to-mole and percent yield” through “Stoichiometry: mass-to-mass and limiting reagent”. Check a worked result against the starting information. Keep a brief working note, revisit an unclear explanation and test one example before moving to another part of the material.

Who is this for?

This course suits students and returning learners studying the named chemistry topic. It also provides a recorded reference for revisiting a topic after an earlier lesson or study attempt. Choose examples appropriate to your background and allow time to work through the method instead of judging understanding only by how familiar the terminology sounds.

Before you start

Basic arithmetic and earlier atomic or molecular concepts are helpful. Keep notes on symbols, units and the conditions stated in each example.

Put the lessons into practice

Select an example from the course and reproduce the reasoning with clear symbols and units. Identify the particles, quantities or conditions involved. Try a second example with a changed value or substance when the lesson demonstrates that type of comparison. Explain which rule or relationship supports each step, then check the result for consistency with the starting information. Build a short glossary linking the main terms to examples from the recordings. Use written study tasks; performing a laboratory experiment is not required for this video course.

This optional study activity is provided by WikiFree for independent practice. Keep your working notes and use the relevant classroom recording to check a step, definition or interpretation. It is not an instructor-marked assignment.

Certificate / Assessment

Watching the public videos and using WikiFree completion tracking does not award a certificate, academic credit, an examination voucher or instructor assessment. Use your practice output to review what you can explain and repeat independently. The recorded lessons provide study material; completion tracking records your progress through that material.

Frequently asked questions

Provider: Khan Academy. Videos play from the Khan Academy channel on YouTube.