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Concept module

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.

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Featured setups

75% yield run

Open the run where the recipe is matched but the output tray stops short of the ideal marker.

Full-yield contrast

Compare the same supplies at 100% yield so the ideal output is fully reached.

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Starter track

Step 3 of 30 / 3 complete

Stoichiometry and Yield

Earlier steps still set up Percent Yield and Reaction Extent.

1. Stoichiometric Ratios and Recipe Batches2. Limiting Reagent and Leftover Reactants3. Percent Yield and Reaction Extent

Previous step: Limiting Reagent and Leftover Reactants.

Start from track beginning

Why it behaves this way

Explanation

Percent yield stays honest when the ideal output marker and the actual product tray sit on the same recipe bench. This module keeps the limiting-reagent story, the theoretical product, and the actual finished batches together so yield never becomes detached algebra.

Reaction extent on this bench is the fraction of the theoretical recipe batches that actually finish. Lower yield does not change the recipe card or the limiting reagent. It changes how much of the possible output appears.

Key ideas

01Theoretical output comes from the limiting-reagent batch cap before yield is applied.
02Percent yield scales actual output relative to that theoretical cap.
03If yield is below 100%, some of the possible output is missing and more reactant packets remain unused than in the full-yield case.

Frozen walkthrough

Step through the frozen example

Frozen walkthrough
Use the actual tray and the ideal marker together.

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Frozen valuesUsing frozen parameters

With 12 A, 18 B, and a 2:3 recipe at 75% yield, how much product appears and how large is the yield gap?

Reactant A packets

reactantAAmountValue

Reactant B packets

reactantBAmountValue

Percent yield

percentYieldValue

1. Read the theoretical batch cap first

The matched 12 A and 18 B run supports 6 theoretical batches on the 2:3 recipe.

2. Scale the actual output by percent yield

At 75% yield, the actual tray reaches 0.75 x 6 = 4.5 product batches.

3. Compare actual output with the ideal marker

The yield gap is 6 - 4.5 = 1.5 batches, so the tray stops short of the theoretical marker.

Actual output and gap

Actual output = 4.5 batches; yield gap = 1.5 batches.
Percent yield measures how much of the limiting-reagent output actually appears, not a new recipe ratio.

Common misconception

A 75% yield means the recipe itself changed to use only 75% of each packet from the start.

The recipe card stays the same. Yield changes how much of the possible output actually finishes.

The same starting supplies can have the same theoretical output while the actual product tray lands lower.

Mini challenge

Hold the recipe fixed, then lower yield until the actual tray clearly stops short of the ideal marker.

Make a prediction before you reveal the next step.

Decide which slider changes the actual output without changing the theoretical batch cap.

Check your reasoning against the live bench.

Percent yield changes the actual output while the theoretical batch cap stays set by the same recipe and limiting reagent.
That keeps theoretical yield and actual yield separated on one bench instead of collapsing them into one number.

Quick test

Reasoning

Question 1 of 2

Answer from the theoretical marker and the actual tray together.

If a run has a theoretical output of 6 batches and a 75% yield, what actual output should the tray show?

Use the live bench to test the result before moving on.

Accessibility

The simulation shows two reactant supply bins, one product tray, and a recipe card that states how many packets of A and B one full batch needs.

A readout card reports the current recipe, the maximum possible batches, which supply is limiting, the actual output, and how much of each reactant is left after the run.

Graph summary

One graph scans possible batches against the A supply, a second scans possible batches against the B supply, and a third compares actual product with the theoretical product as percent yield changes.

The ideal marker and the actual tray stay tied to the same recipe bench so percent yield reads as a visible shortfall from the theoretical output.