If 3.5 g of salicylic acid is heated with an excess of acetic anhydride, what is the theoretical yield of acetylsalicylic acid?
Added by George K.
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The molecular weight of salicylic acid is approximately 138.12 g/mol and the molecular weight of acetylsalicylic acid is approximately 180.16 g/mol. Show more…
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Calculate the theoretical yield of acetylsalicylic acid from 2.01 g of salicylic acid assuming excess acetic anhydride:
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Calculate the theoretical yield of aspirin (FW = 180.158 g/mol) for a reaction where 2.734 g of salicylic acid (FW = 138.121 g/mol) is reacted with excess acetic anhydride?
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Aspirin or acetyl salicylic acid is synthesized by reacting salicylic acid with acetic anhydride: $\mathrm{C}_{7} \mathrm{H}_{6} \mathrm{O}_{3}\quad\quad\quad+\quad\quad\quad\mathrm{C}_{4} \mathrm{H}_{6} \mathrm{O}_{3}\quad \quad \longrightarrow \quad\quad\mathrm{C}_{9} \mathrm{H}_{8} \mathrm{O}_{4}+\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}$ $\begin{array}{llll}\text { salicylic acid } & \text { acetic anhydride } & \quad\quad\quad\quad\quad\text { aspirin } & \text { acetic acid }\end{array}$ (a) How much salicylic acid is required to produce $0.400 \mathrm{g}$ of aspirin (about the content in a tablet), assuming acetic anhydride is present in excess? (b) Calculate the amount of salicylic acid needed if only 74.9 percent of salicylic acid is converted to aspirin. (c) In one experiment, 9.26 g of salicylic acid is reacted with $8.54 \mathrm{g}$ of acetic anhydride. Calculate the theoretical yield of aspirin and the percent yield if only $10.9 \mathrm{g}$ of aspirin is produced.
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