AP Chemistry
4.5 Stoichiometry
A student synthesizes acetylsalicylic acid, \(\text{C}_9\text{H}_8\text{O}_4\) (molar mass \(180\text{ g/mol}\)), by reacting salicylic acid, \(\text{C}_7\text{H}_6\text{O}_3\) (molar mass \(138\text{ g/mol}\)), with an excess of acetic anhydride, \(\text{C}_4\text{H}_6\text{O}_3\) (molar mass \(102\text{ g/mol}\)), according to the equation below.
\[ \text{C}_7\text{H}_6\text{O}_3\text{(s)} + \text{C}_4\text{H}_6\text{O}_3\text{(l)} \rightarrow \text{C}_9\text{H}_8\text{O}_4\text{(s)} + \text{HC}_2\text{H}_3\text{O}_2\text{(l)} \]
The student begins with \(6.90\text{ g}\) of salicylic acid and collects \(5.40\text{ g}\) of pure, dry acetylsalicylic acid. What is the percent yield of acetylsalicylic acid in this experiment?
\[ \text{C}_7\text{H}_6\text{O}_3\text{(s)} + \text{C}_4\text{H}_6\text{O}_3\text{(l)} \rightarrow \text{C}_9\text{H}_8\text{O}_4\text{(s)} + \text{HC}_2\text{H}_3\text{O}_2\text{(l)} \]
The student begins with \(6.90\text{ g}\) of salicylic acid and collects \(5.40\text{ g}\) of pure, dry acetylsalicylic acid. What is the percent yield of acetylsalicylic acid in this experiment?
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