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Theoretical and Percent Yield

Example: Limiting Reagent

Finding Limiting Reagent

Example: 

salicylic acid + acetic anhydride acetylsalicylic acid (ASA) + acetic acid

 

Salicylic acid:  (0.211 g) / (138.1 g/mol) * 1 = 0.00153 mol

 

Acetic anhydride:  (0.480 mL) * (1.08 g/mL) / (102.1 g/mol) * 1 = 0.00508 mol

 

Therefore, salicylic acid is the limiting reagent, since there are less moles of that than there are of acetic anhydride.

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