Stoichiometry Bench — iLearnSTEM Labs

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Ontario Curriculum · Grades 9–12Beta

Stoichiometry BenchSteel wool in copper sulfate

A 10.0 g FeB 25.0 g CuSO4ratio 0.1791 : 0.1566

n(A)0.1791 mol= 10.0 ÷ 55.84

n(B)0.1566 mol= 25.0 ÷ 159.61

limitingrun to analysesmaller n ÷ coefficient wins

theoreticalrun to analyseprediction comes from the measurement

actual / %run to analyse

stoichiometrycoefficients compare moles: 1 mol Fe per 1 mol CuSO4 — never grams

Fe + CuSO4 → FeSO4 + Cu · n = m ÷ M

Ready — weigh the reactants and hit Run reaction.

Chemistry Lab 03 · Stoichiometry Bench — drag to orbit, scroll to zoom

Reaction

Fe + CuSO4 → FeSO4 + Cu

The curriculum’s own percent-yield investigation (D2.7). Red-brown copper plates out and the blue fades; losses to spatter and transfer make the actual yield ≈ 87% of theory.

Reactants

Fe mass10.0 g

n(A) = m ÷ M = 10.0 ÷ 55.84 = 0.1791 mol

CuSO4 mass25.0 g

n(B) = m ÷ M = 25.0 ÷ 159.61 = 0.1566 mol

n(A) ÷ 1 = 0.1791 · n(B) ÷ 1 = 0.1566 — smaller limits

Record logs the prepared masses before a run, or the full yield analysis after one.