Stoichiometry supply mission
You are the supply officer for a deep-space depot. Rockets, life support, and labs all need chemicals made on demand, and every synthesis starts with stoichiometry. Convert grams to moles, find limiting reactants, and hit exact yields to keep the missions flying.
How many moles are in 36 g of H₂O? (M = 18 g/mol)
How to play
Each mission gives you a reaction and a target amount of product.
Calculate how much of each reactant you need, starting from the balanced equation.
Choose which reactant will run out first: that is your limiting reactant.
Enter your amounts; the depot fabricates the product if your math is right.
Complete the delivery before the mission timer runs out.
Scoring
Correct deliveries earn 100 points; exact limiting-reactant identification adds 50. Wasted excess reactant costs 10 points per mission. Finish all missions in a level to unlock the next.
Levels
Cadet supply runs
1:1 mole ratios with friendly numbers to learn the workflow.
Depot logistics
Multi-step conversions between grams, moles, and particles.
Limiting reactant alerts
Identify the limiting reactant under time pressure.
Command missions
Percent yield missions with real-world losses built in.
What chemistry did you just use?
Every mission ran on the same engine: a balanced equation gives mole ratios, molar masses convert grams to moles, and the limiting reactant caps the product. You practiced the full problem-solving chain chemists use daily, from lab prep to industrial scale-up, and saw why excess reactant is deliberately left over in real processes.
Key concepts
- Mole ratios from balanced equations
- Converting between grams and moles
- Limiting reactant determines the product amount
- Theoretical yield and percent yield