WS 05- Key - b How many molecules are in 0.200 mole aspirin...

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Name: _____________________________ Quiz Section:_______ CHEM 120A – Autumn 2011 Worksheet #5 1. In the following reactions, identify which reactant is oxidized and which is reduced: a. 2Al (s) + 3I 2 (s) barb2right 2 AlI 3 (s) b. Cu (s) + 2 Ag + (aq) barb2right 2 Ag(s) + Cu 2+ (aq) c. SiCl 4 (l) + 2Mg (s) barb2right 2MgCl 2 (s) + Si(s) 2. Aspirin (C 9 H 8 O 4 ) is synthesized by reacting salicylic acid (C 7 H 6 O 3 ) with acetic anhydride (C 4 H 6 O 3 ). The balanced equation is C 7 H 6 O 3 + C 4 H 6 O 3 barb2right C 9 H 8 O 4 + HC 2 H 3 O 2 a. What is the molar mass of aspirin?
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Unformatted text preview: b. How many molecules are in 0.200 mole aspirin? c. How many grams of aspirin contain 6.50 x 10 24 atoms of C? d. What mass of acetic anhydride is needed to completely consume 1.00 x 10 2 g salicylic acid? e. In the lab, a student synthesized aspirin by reacting 1.50 g of salicylic acid with 2.00 g acetic anhydride. The yield was 1.50 g of aspirin. What was the percent yield for this experiment?...
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