Homework 3-problems

# Homework 3-problems - kramer (jrk2286) Homework 3 sutcliffe...

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Unformatted text preview: kramer (jrk2286) Homework 3 sutcliffe (90830) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. This is for Exam 3 and so covers chapters 3, 5 and some parts of 16. 001 10.0 points Calculate the number of ethanol molecules (CH 3 CH 2 OH) that would contain 164 grams of carbon. 1. 1.65 10 25 molec 2. 1.89 10 26 molec 3. 4.11 10 24 molec 4. 8.28 10 24 molec 5. 3.73 10 25 molec 6. 5.93 10 26 molec 7. 9.94 10 25 molec 002 10.0 points Calculate the number of carbon atoms in 0.75 L of acetone (CH 3 COCH 3 ). (density = 1.3 g/mL and boiling point = 48.5 degrees Celsius) 1. 1 . 8 10 22 atoms 2. 1 . 10 22 atoms 3. 3 . 10 25 atoms 4. 1 . 8 10 25 atoms 5. 3 . 10 22 atoms 6. 1 . 10 25 atoms 003 10.0 points Balance the equation ? CS 2 +? O 2 ? CO 2 +? SO 2 , using the smallest possible integers. The co- efficient of O 2 is 1. 1. 2. 2. 3. 3. 4. 5. 5. 4. 004 10.0 points Nitrogen dioxide (NO 2 ) is a serious air pol- lutant that is formed when fuels are burned in air. Some of the NO 2 reacts with water in the air as shown below to form nitric acid (HNO 3 ), a major contributor to acid rain. Suppose that 2 . 2 tons of NO 2 are released into the atmosphere, and that 100% of this NO 2 reacts as shown. 3 NO 2 + H 2 O 2 HNO 3 + NO How much atmospheric HNO 3 would be formed in this way? Answer in units of tons. 005 10.0 points For the reaction ? C 6 H 6 + ? O 2 ? CO 2 + ? H 2 O 30 grams of C 6 H 6 are mixed with 79 . 08 grams of O 2 and allowed to react. How much CO 2 could be produced by this reaction? 1. 101 . 4 g 2. 69 . 61 g 3. 74 . 65 g 4. 115 . 7 g 5. 87 . 01 g 6. 108 . 8 g 7. 134 . 9 g kramer (jrk2286) Homework 3 sutcliffe (90830) 2 8. 164 . 4 g 9. 62 . 15 g 10. 182 . 7 g 006 10.0 points What mass of O 2 is required to produce 14.5 g of CO 2 if the reaction has a 65.0% yield? CH 4 + 2 O 2 CO 2 + 2 H 2 O 1. 5.27 g 2. 21.1 g 3. 13.7 g 4. 10.5 g 5. 16.2 g 6. 8.11 g 7. 32.4 g 007 (part 1 of 2) 10.0 points You are asked to identify compound X (a white, crystalline solid), which was extracted from a plant seized by customs inspectors. An elemental analysis of X shows that the mass percentage composition of the compound is 26.86% C and 2.239% H, with the remainder being oxygen. A mass spectrum of X yields a molar mass of 90.0 g/mol. Write the empiricalmolar mass of 90....
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## Homework 3-problems - kramer (jrk2286) Homework 3 sutcliffe...

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