Salicylic+acetic anhydride gives aspirin+acetic acid.Find the percentage yield if 0.85grames of aspirin is formed in the reaction of 1g of Salicylic acid is

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Answer 1

Salicylic acid + acetic anhydride ===> aspirin + acetic acid

C7H6O3 + C4H6O3 ===> C9H8O4 + CH3COOH

moles salicylic acid used = 1 g x 1 mole/138 g = 0.00725 moles

Assuming sufficient acetic anhydride, the moles of aspirin formed will be 0.00725 moles b/c the mole ratio is 1:1

Theoretical mass of aspirin = 0.00725 moles aspirin x 180 g/mole = 1.31 g

Percent Yield = 0.85 g/1.31 g (x100%) = 84.2% yield