Post-lab 3 Chemical Formula-problems

Post-lab 3 Chemical Formula-problems - wetsel (zpw67)...

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1 This print-out should have 29 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. 001 10.0 points The rules o± signifcant fgures do not apply when calculating the answer to the question below. What is the % nitrogen, by weight, in 3 . 6 g o± ammonium sulfde? Answer in units o± %. 002 10.0 points No matter how much extra oxygen is avail- able, 12 g o± carbon always combines with 32 g o± oxygen. This best illustrates the law o± 1. Multiple Proportions. 2. Conservation o± Mass. 3. Defnite Proportions. 4. Conservation o± Energy. 003 10.0 points Analysis o± 20.0 g o± a compound contain- ing only calcium and bromine indicates that 4.00 g o± calcium are present. What is the empirical ±ormula o± the compound ±ormed? 1. CaBr 2 2. Ca 3 Br 2 3. Ca 5 Br 2 4. Ca 7 Br 2 004 (part 1 of 2) 10.0 points Predict the ±ormula ±or the compound ±ormed by sodium and phosphorus. 1. Na 2 P 3 2. NaP 3 3. NaP 4. Na 3 P 5. None o± these 6. Na 2 P 005 (part 2 of 2) 10.0 points Predict the ±ormula ±ormed by calcium and ²uorine. 1. Ca 2 F 2. None o± these 3. CaF 3 4. Ca 3 F 5. CaF 6. Ca 2 F 3 006 10.0 points Which o± the ±ollowing ions are incorrectly named? 1. Fe 2+ iron (II) ion 2. OH - hydrate ion 3. ClO - hypochlorite ion 4. PO 3 - 4 phosphate ion 5. SO 2 - 4 sul±ate ion 007 10.0 points Salicylic acid, used in the synthesis o± as- pirin, has mass composition 60.87% C, 4.38% H, and 34.75% O. What is the empirical ±or- mula o± the compound? 1.
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This note was uploaded on 07/18/2011 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas at Austin.

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Post-lab 3 Chemical Formula-problems - wetsel (zpw67)...

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