Answered: Calculate limiting reagent and percent…

Living By Chemistry: First Edition Textbook

1st Edition

ISBN:9781559539418

Author:Angelica Stacy

Publisher:Angelica Stacy

ChapterU4: Toxins: Stoichiometry, Solution Chemistry, And Acids And Bases

SectionU4.26: Get The Lead Out: Limiting Reactant And Percent Yield

Problem 2E

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Question

Calculate limiting reagent and percent yield

Expert Solution

Given

Reaction between Acetone and Benzaldehye to give Dibenzalacetone via Aldol condensation mechanism.

Solution

The balanced equation is

CH₃COCH₃ + 2C₆H₅CHO $\to$ C₆H₅-CH=CH-CO-CH=CH-C₆H₅

To find the limiting reagent

Yield due to acetone = $\frac{M a s s o f a c e t o n e}{M o l a r m a s s o f a c e t o n e} * M o l a r m a s o f d i b e n z a l a c e t o n e$

= $\frac{0.9 g}{58.08 g / m o l} * 234.29 g / m o l$

= 3.6305 g

Yield due to benzaldehyde = $\frac{M a s s o f b e n z a l d e h y d e}{M o l a r m a s s o f b e n z a l d e h y d e} * M o l a r m a s o f d i b e n z a l a c e t o n e$

= $\frac{2.2 g}{106.12 g / m o l} * 234.29 g / m o l$

= 4.857 g

Acetone gives lower yield. So, Acetone is the limiting reagent. Hence the yield due to Acetone is the theoretical yield.

To find percent yield

Percent yield = $\frac{A c t u a l y i e l d}{T h e o r e t i c a l y i e l d} * 100$

= $\frac{2.92 g}{3.6305 g} * 100$

= 80.43%

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