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Chemistry · Stoichiometry and Yield

Stoichiometric Ratios and Recipe Batches

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Wrap-up

What you learned

Recommended next: Open concept testCheck whether the core ideas are ready without leaving this concept.
Read next: Limiting Reagent and Leftover ReactantsUse the smaller cap as the limiting side.

Key takeaway

A stoichiometric ratio is the packet recipe for one complete reaction batch.
Matched supplies support the same number of complete recipe copies from both reactant bins.
Changing coefficients changes the batch definition, so the same raw supplies can support a different output.
The honest output limit is the smaller recipe-supported batch cap.

Common misconception

Do not decide output from the larger coefficient or larger raw supply alone; always count complete copies of the whole recipe.

The ratio numbers tell you how many packets are needed together for one full batch.

Carry the recipe into the next reaction step

Keep this idea moving

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Find the limiting sideStoichiometry and Yield

Limiting Reagent and Leftover Reactants

Use one recipe bench to see which reactant caps the output first and why the other reactant can remain in excess.

Compare actual vs theoreticalStoichiometry and Yield

Percent Yield and Reaction Extent

Compare actual output with the same theoretical recipe cap so percent yield stays visual and honest on one shared bench.

Useful comparisonRates and Equilibrium

Reaction Rate / Collision Theory

Keep one chemistry box visible so temperature, concentration, activation threshold, and catalysts can be read as changes in successful collisions instead of chemistry slogans.

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Reference and support

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Equation snapshotRecipe-batch snapshot · Maximum full batchesShow 2 equations

Match the supply ratio to the recipe ratio first, then use the smaller batch cap as the honest output limit.

Recipe-batch snapshot
$\frac{B}{A} = \frac{b}{a}$
Both bins support the same number of full batches only when the supply ratio matches the recipe ratio.
Maximum full batches
$b_{m a x} = min (\frac{A}{a}, \frac{B}{b})$
The reaction can finish only as many full batches as the smaller recipe-supported supply allows.

Why it behaves this way

Explanation

Treat the stoichiometric ratio as a recipe for one full batch. If the card says 2 A + 3 B, one batch forms only when those packets are used together. This bench keeps the recipe card, supply bins, and product tray in one view so the ratio stays tied to what the reaction is actually doing.

To read the bench, count how many complete copies of the recipe fit into the current supplies. When the supply ratio matches the recipe ratio, both bins support the same number of full batches. When the recipe changes, the same supplies can support a different number of batches.

Key ideas

01A stoichiometric ratio tells you how many packets of each reactant belong together in one full batch.

02Count complete copies of the recipe, not isolated packets on their own.

03Changing the recipe card changes what counts as one batch, so the same supplies can support a different output.

Worked examples

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Frozen walkthrough

Step through the frozen example

Frozen walkthrough

Use the live recipe bench to count complete recipe copies instead of doing a detached proportion drill.

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View plans

Frozen valuesUsing frozen parameters

How many full batches can 10 A and 15 B make when one batch needs 2 A and 3 B?

A

Reactant A packets

B

Reactant B packets

a

A per batch

1. Read one full batch from the recipe card

One full batch spends 2 packets of A and 3 packets of B together.

2. Count how many copies of the recipe fit

The current setup contains 10 A and 15 B, so A supports 5 batches while B supports 5.

3. Connect those copies to the product tray

That means the bench can finish 5 full batches before the tighter cap takes over.

Maximum full batches

b_{m a x} = 5

full batches

The supply ratio matches the recipe closely, so both caps land on the same batch count.

Common misconception

Use this only when you want to pressure-test a mistaken intuition.

The larger number in the ratio must mean that reactant always makes more product.

The ratio numbers tell you how many packets are needed together for one full batch.

Product depends on how many complete copies of the whole recipe fit into the supplies, not on which number in the ratio is larger.

Quick test

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Current bench

Matched 2:3 recipe preset

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Matched 2:3 recipe

Open a run where the supplies form exact copies of the 2:3 recipe, so both sides finish together.

Flip to 3:2

Switch the recipe card to 3:2 and watch the same supply story produce a different batch count.

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Stoichiometry and Yield

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