Stoichiometry – BCA Tables

BCA Table = organizational tool to aid in solving stoichiometry problems.

• Helps keep track of the amounts (moles!) of reactants and products

throughout a chemical reaction (before, change, after).

Fe + AuSO₄ 🡪 Fe₂(SO₄)₃ + Au

• Ex. Let’s say we react 2.0 moles of Iron with excess Gold (II) Sulfate

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• Utilizing the BCA Table and plugging in known values we can

can calculate (using mole ratios) the amounts of everything else!!!

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2.0 mols

XS

0 mols

0 mols

- 2.0 mols

0.0 mols

- 3.0 mols

XS

+ 1.0 mols

+ 3.0 mols

1.0 mols

3.0 mols

2

3

3

2.0 mol Fe

2 mol Fe

3 mol AuSO₄

= 3.0 mols AuSO₄

2.0 mol Fe

2 mol Fe

1 mol Fe₂(SO₄)₃

= 1.0 mol Fe₂(SO₄)₃

2.0 mol Fe

2 mol Fe

3 mol Au

= 3.0 mols Au