Stiochemistry 1
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Stiochemistry 1

Course Number: CH 301, Spring 2010

College/University: University of Texas

Word Count: 955

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tong (eyt88) H02: Stoichiometry mccord (51600) This print-out should have 29 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. This assignment comes from Chapters 2 and 3 in your book. Nomenclature (the naming of compounds, etc...) is in Chapter 2. Chapter 3 is on stoichiometry. You need to know how to calculate all the types of problems on this...

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(eyt88) tong H02: Stoichiometry mccord (51600) This print-out should have 29 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. This assignment comes from Chapters 2 and 3 in your book. Nomenclature (the naming of compounds, etc...) is in Chapter 2. Chapter 3 is on stoichiometry. You need to know how to calculate all the types of problems on this homework. ALEKS does do this well. READ Chapter 3 and LOOK at the examples. This is important although I will not formally cover it in class. You are expected to know this already. 001 10.0 points Which compound has the wrong chemical formula? 1. (NH4)2 SO4 8. KCrO3 2. Ba3 (PO4 )2 3. Mg(OH)2 4. CaOH 002 10.0 points Cobalt(III) oxide would be the label for 1. Co3 O2 . 2. 3.05 moles of argon 2. CoO. 3. 3.05 moles of CH4 3. CoO3 . 4. 3.05 moles of water 4. Co2 O3 . 5. 3.05 moles of helium 5. Co3 O. 003 10.0 points Give the formula for aluminum hydroxide. 1. AlOH3 2. Al(OH)3 3. AlOH 005 10.0 points How many atoms are in 0.0245 mol K? Answer in units of atoms. 4. AlH3 1 004 10.0 points Choose the formula for the compound potassium dichromate. 1. K2 Cr3 O4 2. K2 Cr3 3. K2 Cr2 O7 4. K2 Cr 5. K2 CrO4 6. KCrO4 7. KCr2 O7 006 10.0 points Which one has the greatest number of atoms? 1. All have the same number of atoms 007 10.0 points Each mole of Al(NO3)3 contains how many moles of oxygen atoms? 1. 3 mol 2. 6 mol 3. 1 mol tong (eyt88) H02: Stoichiometry mccord (51600) 4. 9 mol 5. 12 mol 008 10.0 points Find the molar mass for NaNO3 . 1. 85.00 g/mol 2. 37.9 mL 2. 62.01 g/mol 3. 64,300 mL 3. 70.99 g/mol 4. 0.464 mL 4. 69.00 g/mol 5. 3110 mL 5. 53.00 g/mol 6. 7.83 mL 009 10.0 points What is the percentage of chromium in 5.24 grams of aluminum dichromate? 1. 49.56% 2. 79.39% 1. None of these 3. 75.53% 2. 856 mol 4. 42.80% 3. 46.1 mol 5. 44.45% 4. 109 mol 6. 83.45% 5. 1085 mol 010 10.0 points If 100.0 grams of copper (Cu) completely reacts with 25.0 grams of oxygen, how much copper(II) oxide (CuO) will form from 140.0 grams of copper and excess oxygen? (Note: CuO is the only product of this reaction.) 1. 150.0 g 2. 35.0 g 3. 160.0 g 4. 175.0 g 5. 200.0 g 6. 1.09 mol 7. 9.0 mol 8. 1520 mol 2 011 10.0 points What is the volume of 1.56 kg of a compound whose molar mass is 81.86 g/mole and whose density is 41.2 g/mL? 1. 3.11 mL 012 10.0 points Ethanol (C2 H6 O) is a common intoxicant and fuel produced from the fermentation of various grains. How many moles of ethanol are represented by 50.0 kg of ethanol? 013 10.0 points How many atoms of mercury are present in 8.3 cubic centimeters of liquid mercury? The density of mercury is 13.55 g/cc. Answer in units of atoms. 014 10.0 points Paclitaxel, which is extracted from the Pacic yew tree Taxus brevifolia, has antitumor ac- tong (eyt88) H02: Stoichiometry mccord (51600) tivity for ovarian and breast cancer. It is sold under the trade name Taxol. On analysis, its mass percentage composition is 66.11% C, 6.02% H, and 1.64% N, with the balance being oxygen. What is the empirical formula of paclitaxel? 1. C49 H53 NO16 2. C4 H5 NO9 3. C35 H41 NO8 4. C45 H50 NO13 5. C47 H51 NO14 6. C3 H5 NO4 015 10.0 points 14 carat gold has a purity of 58.3%. How many of moles gold are in 186 grams of 14 carat gold? Answer in units of moles. 016 10.0 points A sample of air contains 22 g/m3 of beryllium dust. How many atoms of beryllium are present in a room with dimensions of 9 feet by 10.8 feet by 17.9 feet? Answer in units of atoms. 017 10.0 points Balance the equation ? H2 CO + ? H2 O ? CH4 + ? O3 . The coecients are 1. 3; 3; 2; 2. 2. 1; 2; 2; 3. 1. 3.3 g 3. 2; 1; 2; 1. 2. 4.9 g 4. 3; 3; 3; 2. 3. 4.4 g 5. 3; 2; 1; 2. 4. 9.8 g 3 018 10.0 points Consider the reaction 4 Fe(s) + 3 O2 (g) 2 Fe2 O3 (s). If 12.5 g of iron(III) oxide (rust) are produced from 8.74 g of iron, how much oxygen gas is needed for this reaction? 1. 8.74 g 2. 21.2 g 3. 7.5 g 4. 12.5 g 5. 3.74 g 019 10.0 points How much O2 is required for the complete reaction of 36 g of C3 H6 to form CO2 and H2 O? 1. 3.86 mol 2. 0.857 mol 3. 7.71 mol 4. 4.29 mol 5. 1.93 mol 020 10.0 points Upon heating, potassium chlorate produces potassium chloride and oxygen: 2 KClO3 2 KCl + 3 O2 . What mass of oxygen (O2 ) would be produced upon thermal decomposition of 25 g of potassium chlorate (KClO3 with MW 122.5 g/mol)? tong (eyt88) H02: Stoichiometry mccord (51600) 5. 6.5 g 021 In the reaction 10.0 points 1. 5.62 1024 molecules 2. 3.19 1024 molecules 3. 1.69 1025 molecules 4. 1.59 1024 molecules 5. 1.26 1025 molecules 025 For the reaction 10.0 points 4 ? CO+? O2 ? CO2 , how much oxygen is required to convert 14 g of CO into CO2 ? 1. 16 g 2. 8 g 3. 28 g 4. 14 g 5. 4 g 6. 32 g 022 10.0 points Given the reaction 2 C2 H2 (g) + 5 O2 (g) 4 CO2 (g) + 2 H2O(g) , how much oxygen gas is needed for the complete combustion of 117 g of acetylene (C2 H2 )? Answer in units of g. 023 10.0 points Consider the reaction H3 PO4 + 3 NaOH Na3 PO4 + 3 H2 O How much Na3 PO4 can be prepared by the reaction of 5.58 g of H3 PO4 with an excess of NaOH? Answer in units of g. 024 10.0 points Consider the reaction N2 + 3 H2 2 NH3 . ? C6 H6 + ? O2 ? CO2 + ? H2 O 30.3 grams of C6 H6 are allowed to react with 106.1 grams of O2 . How much CO2 will be produced by this reaction? Answer in units of grams. 026 For the reaction 10.0 points ? H2 + ? O2 ? H2O , what is the maximum amount of H2 O (18.0153 g/mol) which could be formed from 17.35 g of H2 (2.01588 g/mol) and 0.225 mol of O2 (31.9988 g/mol)? Answer in units of mol. 027 10.0 points How much AlCl3 is produced upon reaction of 4.5 moles of Al and 10.5 moles of HCl with a 36.5% yield? 2 Al + 6 HCl 2 AlCl3 + 3 H2 1. 467 g 2. Not enough information. 3. 1640 g 4. 170 g 5. 598 g How much NH3 can be produced from the reaction of 74.2 g of N2 and 14.0 moles of H2 ? 6. 1280 g tong (eyt88) H02: Stoichiometry mccord (51600) 7. 218 g 028 10.0 points Consider the reaction CaCN2 + 3 H2 O CaCO3 + 2 NH3 . How much NH3 is produced upon reaction of 6.05 moles of CaCN2 and 302 g of H2 O given that the percent yield is 45.9%? 1. 12.1 mol 2. 11.5 mol 3. 87.2 mol 4. 11.2 mol 5. 5.13 mol 6. 5.55 mol 7. 3.02 mol 8. 1.39 mol 029 For the reaction 10.0 points 5 CH4 + 4 Cl2 CCl4 + 4 HCl , If 72% of the methane is converted to carbon tetrachloride, what mass of methane is needed to produce 180 tons of CCl4 ? (1 ton = 2000 pounds) 1. 13 tons 2. 26 tons 3. 16 tons 4. 180 tons 5. 19 tons

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