Chemistry · Topic 4 · Stoichiometry
Moles & formulae. See every step.
Enter what you know and watch the mole triangle solve it — mass ⇄ moles, concentration, and empirical formula from masses or percentages — with full working, not just an answer.
0620 Topic 4 — Stoichiometry
moles · Mr · concentration · empirical formula
Key relationships
moles = mass ÷ Mr
mass = moles × Mr
Mr = mass ÷ moles
mass = moles × Mr
Mr = mass ÷ moles
moles = concentration × volume(dm³)
concentration = moles ÷ volume
concentration = moles ÷ volume
Empirical: divide each mass/Mr by the smallest, then scale to whole numbers.