General Chemistry · Module 7 · Moles and stoichiometry

Stoichiometry Walkthrough

Make the mole real: watch atoms get counted by weighing, molecules fall apart into formula tallies, equations balance atom by atom, and reactions run until one reactant runs out. Go at your own pace. Nothing here is graded.

Speed

Think of it like this

Quick check

Wrong answers are fine here. Read why, then try again.

Dr. Akash Garg · General Chemistry Study Tools · Particle drawings are simplified and not to scale. CC BY-NC-SA 4.0
Use the left and right arrow keys to move between steps. Practice next in the Stoichiometry Lab. Atoms are drawn as colored spheres with their symbols (hydrogen white, carbon dark grey, nitrogen blue, oxygen red, chlorine green, sodium purple). Molecules are flattened into two dimensions, each drawn particle stands for a huge number of real ones, and reactions are sped up so you can watch them. Atomic masses are rounded table values.