bch1049_Assign_1 - H 6 O 3 ) and acetic anhydride (C 4 H 6...

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BCH 1049 Assignment One – Due: 13 February 2007 1. The element lead (Pb) consists of four naturally occurring isotopes with atomic masses 203.97302, 205.97444, 206.97587, and 207.97663 amu. The relative abundances of these four isotopes are 1.4, 24.1, 22.1, and 52.4%, respectively. From these data, calculate the atomic weight of lead. 2. The fermentation reaction of glucose (C 6 H 12 O 6 ) produces ethanol (C 2 H 5 OH) and CO 2 : C 6 H 12 O 6 ( aq ) 2 C 2 H 5 OH( aq ) + 2 CO 2 ( g ) (a) How many moles of CO 2 are produced when 0.400 mol of C 6 H 12 O 6 undergoes this reaction? (b) How many grams of C 6 H 12 O 6 are needed to form 7.50 g of C 2 H 5 OH? (c) How many grams of CO 2 form when 7.50 g of C 2 H 5 OH are produced? 3. Aspirin (C 9 H 8 O 4 ) is produced from salicylic acid (C 7
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Unformatted text preview: H 6 O 3 ) and acetic anhydride (C 4 H 6 O 3 ): C 7 H 6 O 3 + C 4 H 6 O 3 C 9 H 8 O 4 + C 2 H 4 O 2 (a) How much salicylic acid is required to produce 150 kg of aspirin, assuming that all of the salicylic acid is converted to aspirin? (b) How much salicylic acid would be required if only 80% of the salicylic acid is converted to aspirin? (c) What is the theoretical yield of aspirin if 185 kg of salicylic acid is allowed to react with 125 kg of acetic anhydride? (d) If the situation described in part (c) produces 182 kg of aspirin, what is the percentage yield? (e) Draw the molecular structures for the two products, C 9 H 8 O 4 and C 2 H 4 O 2 ....
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