Lesson 9: Reacting Masses Flashcards by Bathroom Sink | Brainscape

Q

A

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Q

Percentage Yield

Theoretical Yield

Meaning

A

Maximum amount of product obtainable.

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Q

Percentage Yield

Theoretical Yield

Likelihood

A

Achieving theoretical yield is very unlikely.
Reaction may be reversible or not be finished.
Other reactions (side reactions) may have taken place alongside the main one.
Some product may be lost in purification/separation.

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Q

Percentage Yield

Formula

A

Percentage Yield = (Actual Yield ÷ Theoretical Yield) × 100

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Q

Percentage Yield

Calculation

A

Step 1: number of moles of product from mass of product ÷ Mr of reactant.
Step 2: theoretical yield from [step 1] × Mr of product.
Step 3: percentage yield formula.

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Q

Limiting Reactants

Description

A

In most reactions, there won’t be an equal amount of both reactants.
One reactant will be in excess.
The ‘limiting reagent’ will be completely used up and end the reaction.
A reactant in excess will not be used up.

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Q

Limiting Reactants

Reacting Masses

A

The reactant in excess cannot be used to base mole calculations from.

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