Multi-step problem walker
One problem, every step
Real chemistry problems span several modules — name a compound, balance an equation, do mole math, find a yield. This module strings the steps together. Pick a problem, then walk through it one beat at a time.
How to use it
- Pick a problem from the grid below.
- Read the statement, then work through the steps in order.
- Each step is multiple choice or a numeric answer. Take a hint if you need one — it costs nothing.
- The final card shows the full solution and the connection back to other chemistry modules.
Pick a problem
Walk-through
Reference
The chemistry conversion map
Every stoichiometry problem is some path through this map.
grams (A) ──÷ M(A) ──→ moles (A) ──× ratio ──→ moles (B) ──× M(B) ──→ grams (B)
↑ ↓
÷ Nₐ × Nₐ
↑ ↓
particles (A) particles (B)
Quick formulas
Moles ↔ mass
n = m / M
Moles ↔ particles
N = n × Nₐ
Moles ↔ gas vol (STP)
V = n × 22.4 L
Molarity
M = n / V (in L)
Dilution
M₁V₁ = M₂V₂
Percent yield
actual / theoretical × 100
Avogadro
Nₐ = 6.022×10²³
Limiting reagent
smallest n / coefficient