Unformatted text preview: 1 mol aspirin Theoretical yield 1 0.0218 moi salicylic acid (W 180.2 g aspirin = 3.93 as his
1 mo] aspirin ) g p Finally the computer calculates the percentage yield from the actual and theoretical yields. Actual yield = (22.55 g - 20.52 g) . = —_ 1
Percentage yield Theoretical yield ( 00) 3.93 (100) = 52% Sample Examination Questions
1. Which of the following statements about acetic anhydride is (are) true?
a. It reacts with water to produce acetic acid.
b. An acetic anhydride molecule contains two aoetyl groups joined by an oxygen atom.
c. An acetic anhydride molecule contains a ring of six carbons.
d. Only statements (a) and (b) are true.
c. All three statements are true.
2. Which of the substances employed in the synthesis of aspirin is particularly hazardous? Describe the danger of this substance and the precautions you should use to ensure the safety
of yourself and others. 3. Which of the following substances was used to increase the reaction rate in the synthesis of
aspirin in Block H? a. phosphoric acid b. hydrochloric acid c. sulfuric acid d. acetic acid e. sodium hydroxide 4. Which of the follouﬂng statements about aspirin is (are) true?
a. Its scientiﬁc name is acetylsalicylic acid. b. Its formula is C7H603. c. It contains an OH group bonded to one of six carbon atoms in a ring.
d. Only statements (a) and (c) are true. e. Only statements (b) and (c) are true. 71 ...
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- Fall '08