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Chemistry Test Bank: Mole Concept, Stoichiometry, Chemical Reactions
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1. One mole of any substance contains Avogadro’s number of particles of that substance. What is the numerical value of Avogadro’s number? A. 6.022 ×10 B. 1.00 ×10 C. 12.01 −23 −14 D. 1.661 ×10 E. 6.022 ×10 −24 23 Accessibility: Keyboard Navigation Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 2. What is the mass of 4.00 moles of helium, the gas commonly used to fill party balloons and lighter-than-air ships? A. 4 amu B. 4.00 g C. 8.00 g D. 16.0 g 24 E. 2.41 × 10 g Accessibility: Keyboard Navigation Bloom's Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 22 3. A sample of aluminum contains 2.91 × 10 atoms of aluminum. What is the mass of this sample? [Molar mass: Al, 26.98 g/mol] A. 0.767 g B. 1.30 g C. 558 g 21 D. 1.08 × 10 g 23 E. 7.85 × 10 g Accessibility: Keyboard Navigation Bloom's Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 5. Which notation properly indicates how two molecules of diatomic oxygen would be represented in a chemical equation? A. (O2)2 B. O4 C. 2O2 D. O2O2 E. All of the choices are correct. Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.04 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 6. Which has the greatest mass, one atom of carbon, one atom of hydrogen, or one atom of lithium? A. one atom of carbon B. one atom of hydrogen C. one atom of lithium 1-1 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. D. All three atoms have the same mass. E. It is impossible to determine. Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Topic: Chemical Calculations 7. What is the mass of one mole of diatomic hydrogen, H2? A. 1.01 amu B. 2.02 amu C. 1.01 g D. 2.02 g 23 E. 6.022 × 10 g Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Topic: Chemical Calculations 8. How many molecules of water are present in a 5.65 mole sample of water? 24 A. 4.00 × 10 molecules 23 B. 1.07 × 10 molecules 24 C. 3.40 × 10 molecules −24 D. 9.39 × 10 molecules 25 E. 4.00 × 10 molecules Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 9. The mass of one atom of oxygen is 16.00 amu. What is the mass of one mole of elemental oxygen (O2)? A. 32.00 amu B. 32.00 g 24 C. 9.64 × 10 g 25 D. 1.93 × 10 g 22 E. 1.88 × 10 g Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 10. Which statement best describes the Law of Conservation of Mass? A. The masses of the reactants in a chemical reaction are always equal. B. The mass of the product formed in a chemical reaction is determined by the limiting reactant. C. The mass of the product formed in a chemical reaction is equal to the mass of the reactant in the smallest amount. D. Matter is neither gained nor lost in a chemical reaction. E. When two or more products are formed in a chemical reaction, their masses will always be equal. Accessibility: Keyboard Navigation Bloom’s Level: 1. Remember Difficulty: Easy 1-2 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Gradable: automatic Section number: 04.03 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 11. Which symbol, often found in chemical equations, indicates that a substance is dissolved in water? A. (w) B. (l) C. (aq) D. (d) E. ∆ Accessibility: Keyboard Navigation Bloom’s Level: 1. Remember Difficulty: Easy Gradable: automatic Section number: 04.03 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 12. Consider the two beakers labeled A and B. Beaker A contains 1 mole of iron atoms, and Beaker B contains 1 mole of lead atoms. Which statement concerning these samples is known with certainty? A. Beakers A and B contain an equal number of atoms. B. Beakers A and B contain equal masses of atoms. C. Beakers A and B contain an equal volume of atoms. D. Beakers A and B contain samples with the same density. E. None of these are correct. Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 13. The chemical equation below is unbalanced. What is the coefficient of water when the equation is balanced? Mg(OH)2(s) + HCl(g) → MgCl2(s) + H2O(l) A. 1 B. 2 C. 3 D. 4 E. No coefficient would be shown. Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.04 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 14. Aluminum metal and oxygen gas are produced when aluminum oxide is heated at high temperature. Which statement concerning this chemical change is true? A. Aluminum oxide is the product in this reaction. B. This reaction is a combustion reaction. C. Aluminum and oxygen are the reactants in this reaction. D. This reaction is a decomposition reaction. E. The chemical equation for this reaction is: AlO2(s) → Al(s) + O2(g). Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Medium Gradable: automatic 1-3 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Section number: 04.03 Subtopic: Types of Chemical Reactions Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 15. The unbalanced equation for the combustion of octane, a component of gasoline, is shown below. What would be the coefficient of carbon dioxide once the equation is balanced? C8H18(l) + O2(g) → CO2(g) + H2O(l) A. 8 B. 25 C. 16 D. 18 E. No coefficient would be shown. Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.04 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 16. The chemical equation below is not balanced. Balance the equation, then determine which statement concerning the balanced equation is TRUE. KClO3(s) → KCl(s) + O2(g) A. The balanced equation will have an equal number of moles of reactants and products. B. The balanced equation will have three atoms of oxygen on each side. C. The balanced equation will have one atom of potassium on each side. D. The balanced equation will have two atoms of chlorine on each side. E. The balanced equation will contain a substance whose coefficient is 1. Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.04 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 17. Consider the chemical equation shown below. How many moles of oxygen gas are needed to react with hydrogen to form 1.0 mole of water? 2H2(g) + O2(g) → 2H2O(l) A. 0.5 mol B. 1 mol C. 3 mol D. 4 mol E. 5 mol Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Medium Gradable: automatic Section number: 04.09 Subtopic: Mole Conversions Topic: Chemical Calculations 18. Hydrogen fluoride will react with glass (silicon dioxide, SiO2) according to the equation below. What mass of HF is required to react completely with 16.0 g of glass? [Molar masses: Si, 28.09 g/mol; F, 19.00 g/mol; H, 1.01 g/mol; O, 16.00 g/mol] 4HF(g) + SiO2(s) → SiF4(g) + 2H2O(g) 1-4 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. A. 5.33 g B. 21.3 g C. 64.0 g D. 80.0 g E. 320 g Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Hard Gradable: automatic Section number: 04.09 Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations 19. Glucose (C6H12O6) is an important energy-rich compound produced by photosynthesis according to the equation below. What mass of glucose can be produced from 2.61 mol of CO2 and the necessary water? [Molar masses: C, 12.01 g/mol; H, 1.01 g/mol; O, 16.00 g/mol] 6CO2(g) + 6H2O(l) → C6H12O6(l) + 6O2(g) A. 0.0128 g B. 0.0869 g C. 69.0 g D. 78.4 g E. 414 g Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Medium Gradable: automatic Section number: 04.09 Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations 22. The fluoride rinse in dental offices usually contains sodium fluoride. Sodium fluoride can be prepared from the reaction between sodium metal and fluorine gas. Which of the following properly represents the balanced chemical equation for this reaction? A. Na(s) + F2(g) → NaF2(s) B. Na(s) + F(g) → NaF(s) C. 7Na(s) + F(g) → Na7F(s) D. 2Na(s) + F2(g) → 2Na2F(s) E. 2Na(s) + F2(g) → 2NaF(s) Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.04 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 23. How is the reaction shown below best classified? Ca(s) + 2HCl(aq) → CaCl2(g) + H2(g) A. decomposition B. combination C. single-replacement D. double-replacement E. precipitation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic 1-5 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Section number: 04.03 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 24. How is the reaction shown below best classified? 2NaCl(s) + F2(g) → 2NaF(s) + Cl2(g) A. decomposition B. combination C. single-replacement D. double-replacement E. precipitation Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.03 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 25. How is the reaction shown below best classified? 2HgO(s) → 2Hg(l) + O2(g) A. decomposition B. combination C. single-replacement D. double-replacement E. combustion Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.03 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 26. What is the mass of a 0.150 mole sample of sulfur? A. 5.17 g B. 4.68 g C. 214 g D. 0.208 g E. 4.81 g Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Topic: Chemical Calculations 27. A sample of sulfur contains 1.81 × 1024 atoms of sulfur. How many moles of sulfur does this represent? A. 1.81 mol B. 3.01 mol C. 0.333 mol D. 1.09 mol E. 1.77 mol Accessibility: Keyboard Navigation 1-6 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculation 28. Diamond is a pure form of the element carbon. If a 2-carat diamond has a mass of 0.396 g, how many carbon atoms are contained in this diamond? 22 A. 3.97 × 10 atoms −25 B. 6.58 × 10 atoms 23 C. 1.99 × 10 atoms 22 D. 1.99 × 10 atoms 23 E. 2.38 × 10 atoms Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 29. Cis-platin is a chlorine-containing chemotherapy agent with the formula Pt(NH3)2Cl2. What is the mass of one mole of cis-platin? A. 283.02 g/mol B. 286.05 g/mol C. 300.06 g/mol D. 488.91 g/mol E. 492.37 g/mol Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Topic: Chemical Calculations 30. Dinitrogen monoxide, or laughing gas (N2O), is used as a dental anesthetic and as an aerosol propellant. How many molecules of N2O are present in a 12.6 g sample of the compound? 23 A. 1.72 × 10 molecules B. 1.289 molecules 26 C. 3.34 × 10 molecules 24 D. 7.59 × 10 molecules 23 E. 5.14 × 10 molecules Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 1-7 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 31. When the equation below is balanced with the lowest possible whole number coefficients, what is the sum of the coefficients? Ca(s) + HCl(g) → CaCl2(s) + H2(g) A. 2 B. 4 C. 5 D. 8 E. 10 Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.04 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 32. Lithium oxide can be produced by the reaction shown below. If a manufacturing company wants to make 25.0 g of Li2O, what mass of Li is necessary? [Molar masses: Li, 6.94 g/mol; O, 16.00 g/mol] 4Li(s) + O2(g) → 2Li2O(s) A. 0.0861 g Li B. 2.903 g Li C. 11.6 g Li D. 12.5 g Li E. 23.2 g Li Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Hard Gradable: automatic Section number: 04.09 Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations 33. What mass of sodium hydroxide is necessary to react with a solution containing 73.00 g HCl, according to the chemical equation below? [Molar masses: NaOH, 39.99 g/mol; HCl, 36.45 g/mol] NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l) A. 80.09 g B. 66.54 g C. 39.99 g D. 1.850 g E. 7.445 g Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Hard Gradable: automatic Section number: 04.09 Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations 34. Iron reacts with oxygen to form iron(III) oxide according to the chemical equation below. What is the theoretical yield of product when 5.00 grams of Fe reacts with excess O2? [Molar masses: Fe, 55.85 g/mol; O, 16.00 g/mol] 4Fe(s) + 3O2(g) → 2Fe2O3(s) 1-8 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. A. 13.1 g B. 6.53 g C. 7.15 g D. 2.50 g E. 70.5 g Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Hard Gradable: automatic Section number: 04.09 Subtopic: Calculating Amounts of Reactant and Product Subtopic: Reaction Yield Topic: Chemical Calculations 35. Magnesium hydroxide, Mg(OH)2, as "Milk of Magnesia" can be used to neutralize excess stomach acid, represented by HCl(aq), according to the chemical equation below. Mg(OH)2(s) + 2HCl(aq) → MgCl2(aq) + 2H2O(l) When 5.00 g of HCl are combined with an excess of Mg(OH)2, what mass of MgCl2 can be produced? [Molar masses: H, 1.01 g/mol; O, 16.00 g/mol; Mg, 24.31 g/mol; Cl, 35.45 g/mol] A. 13.1 g B. 6.53 g C. 0.957 g D. 2.50 g E. 70.5 g Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Hard Gradable: automatic Section number: 04.09 Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations 36. To convert a given number of moles into the number of atoms, one would multiply by which of the following factors? 23 A. 6.022 × 10 atoms/1 mol 23 B. 1 mol/6.022 × 10 atoms -24 C. 1.66 × 10 atoms/1 mol D. 1 mol/1.66 × 10 E. molar mass -24 atoms Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 37. The average mass of one atom of copper is 63.55 amu. What is the mass of Avogadro's number of copper atoms? 25 A. 3.827 × 10 amu B. 63.55 g 25 C. 3.827 × 10 g D. 63.55 atoms E. 63.55 formula units Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic 1-9 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. Section number: 04.01 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 38. What is the mass of 1.00 mole of carbon atoms? A. 6.022 g B. 12.01 g C. 7.232 g 23 D. 6.022 × 10 g 24 E. 7.232 × 10 g Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Topic: Chemical Calculations 39. What is the mass of 3.01 mol of sulfur atoms? 24 A. 1.81 × 10 g B. 32.06 g C. 3.01 g D. 0.150 g E. 96.5 g Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Topic: Chemical Calculations 40. How many moles of Au atoms are present in one ounce of pure gold? [1 oz = 28.4 g] 2 A. 1.97 × 10 mol B. 6.94 mol C. 0.144 mol D. 0.0721 mol -3 E. 5.08 × 10 mol Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Topic: Chemical Calculations 41. How many atoms of sulfur are present in a 155 g sample of sulfur? [Molar mass: S, 32.06 g/mol] 24 A. 2.91 × 10 atoms 23 B. 6.02 × 10 atoms 23 C. 3.01 × 10 atoms 23 D. 2.91 × 10 atoms 23 E. 2.01 × 10 atoms Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 1-10 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 42. How many iron atoms are present in 0.552 mol of iron? 24 A. 2.798 × 10 23 B. 6.02 × 10 C. 27.98 23 D. 3.32 × 10 E. 55.85 Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 43. What is the formula mass of carbon dioxide? [Atomic masses: C, 12.01 amu; O, 16.00 amu] A. 28.01 amu B. 28.01 g C. 44.01 amu D. 44.01 g E. 44.01 mol Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Topic: Chemical Calculations 44. Aspirin is the common name for acetyl salicylic acid, C9H8O4. One tablet contains 0.325 g of aspirin. How many moles of aspirin is this? -6 A. 1.80 × 10 mol -3 B. 1.80 × 10 mol C. 0.554 mol D. 554 mol 23 E. 1.96 × 10 mol Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Topic: Chemical Calculations 45. What is the mass of a 0.0200 mol sample of nicotine? [Formula mass: nicotine, 162.2 amu] A. 1.23 × 10-4 g B. 0.308 g C. 3.24 g D. 32.4 g E. 8.11 × 103 g Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Topic: Chemical Calculations 46. How many molecules are present in a 0.0200 mol sample of nicotine? A. 0.0400 molecules 22 B. 1.20 × 10 molecules 1-11 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 22 C. 2.41 × 10 molecules 23 D. 6.02 × 10 molecules 23 E. 1.20 × 10 molecules Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 47. How many aspirin molecules are present in a 0.325 g sample of aspirin? [Molar mass: aspirin, 180.2 g/mol] 21 A. 1.09 × 10 molecules −3 B. 1.80 × 10 molecules 23 C. 1.96 × 10 molecules 23 D. 3.91 × 10 molecules E. 58.57 molecules Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 48. The chemical equation below is not balanced. What is the coefficient of iron when the equation is balanced with smallest whole number coefficients? Fe(s) + O2(g) → Fe2O3(s) A. 1 B. 2 C. 3 D. 4 E. 8 Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.04 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 49. Incomplete combustion occurs when there is insufficient oxygen to react with a compound. The suffocating gas carbon monoxide is a product of incomplete combustion. How many moles of oxygen gas are required for the complete combustion of 11.0 moles of C6H14, a component of gasoline? C6H14(l) + 19O2(g) → 12CO2(g) + 14H2O(l) A. 1.16 mol O2 B. 28.0 mol O2 C. 105 mol O2 D. 209 mol O2 E. 418 mol O2 Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Easy Gradable: automatic Section number: 04.09 Subtopic: Mole Conversions Topic: Chemical Calculations 1-12 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 50. Which of the choices is the correctly balanced form of the following equation? C6H14(l) + O2(g) → CO2(g) + H2O(l) A. C6H14(l) + 13O2(g) → 6CO2(g) + 7H2O(l) B. C6H14(l) + 19O(g) → 6CO2(g) + 7H2O(l) C. C6H14(l) + 19O2(g) → 6CO2(g) + 7H2O(l) D. 2C6H14(l) + 19O2(g) → 12CO2(g) + 14H2O(l) E. C12H28(l) + 38O(g) → 12CO2(g) + 14H2O(l) Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.04 Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions 51. How many moles of hydrogen gas are needed to react with oxygen to form one mole of water? 2H2(g) + O2(g) → 2H2O(l) A. 0.5 mol B. 1 mol C. 2 mol D. 4 mol E. 6 mol Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Easy Gradable: automatic Section number: 04.09 Subtopic: Mole Conversions Topic: Chemical Calculations 52. Methanol (CH3OH) is the fuel used by racecars in the Indianapolis 500. It burns in the engine according to the equation below. How many moles of oxygen gas are necessary to react completely with 425 moles of methanol? 2CH3OH(l) + 3O2(g) → 2CO2(g) + 4H2O(g) A. 3 mol B. 255 mol C. 283 mol D. 638 mol E. 1275 mol Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Easy Gradable: automatic Section number: 04.09 Subtopic: Mole Conversions Topic: Chemical Calculations 53. Methanol (CH3OH) is the fuel used by racecars in the Indianapolis 500. It burns in the engine according to the equation below. How many moles of oxygen gas are necessary to react completely with 12.5 L of methanol? [Density: CH3OH, 0.7910 g/mL; Molar mass: CH3OH, 32.05 g/mol] 2CH3OH(l) + 3O2(g) → 2CO2(g) + 4H2O(g) 1-13 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. A. 0.462 mol B. 2.16 mol C. 463 mol D. 740 mol E. 1850 mol Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Hard Gradable: automatic Section number: 04.09 Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations 56. Classify the following reaction: H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(aq) A. precipitation B. acid- base neutralization C. combination D. decomposition E. combustion Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.07 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 59. Choose the best classification of the reaction represented by the following equation: 2KClO3(s) → 2KCl(s) + 3O2(g) A. decomposition B. combination C. single-replacement D. double-replacement E. None of the choices are correct. Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.03 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 60. Choose the best classification of the reaction represented by the following equation: Na2SO4(aq) + Ba(OH)2(aq) → BaSO4(s) + 2NaOH(aq) A. decomposition B. combination C. single-replacement D. double-replacement E. None of the choices are correct. Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.03 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 1-14 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 61. Prozac, a drug prescribed to treat depression, has the formula C17H18F3NO. If a patient was administered 15.0 mg of Prozac, how many moles of Prozac did he receive? [Molar mass: Prozac, 309.36 g/mol] −5 A. 4.85 × 10 mol B. 48.5 mol C. 20.6 mol D. 4640 mol 19 E. 2.92 × 10 mol Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Topic: Chemical Calculations 62. Choose the best classification of the reaction represented by the following equation: C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l) A. combustion B. acid-base neutralization C. single-replacement D. decomposition E. combination Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.08 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 63. Choose the best classification of the reaction represented by the following equation: HBr(aq) + KOH(aq) → KBr(aq) + H2O(l) A. combustion B. combination C. single-replacement D. decomposition E. acid-base Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.07 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 66. Choose the best classification of the reaction represented by the following equation: MgO(s) + CO2(g) → MgCO3(s) A. single-replacement B. double-replacement C. combination D. decomposition E. acid-base neutralization Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.03 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 1-15 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 68. Consider the hypothetical reaction: 3A2 + 2B → C + 2D When 25 g of reactant A and 34 g of reactant B are combined, the theoretical yield of product C is 31 g. If the actual yield of product C is 19 g, what is the percent yield of C? A. 53% B. 61% C. 76% D. 56% E. 85% Accessibility: Keyboard Navigation Bloom’s Level: 4. Analyze Difficulty: Easy Gradable: automatic Section number: 04.09 Subtopic: Reaction Yield Topic: Chemical Calculations 69. Choose the best classification of the reaction represented by the following equation: BaCl2(aq) + K2SO4(aq) → BaSO4(s) + 2KCl(aq) A. single-replacement B. double-replacement C. combination D. decomposition E. acid-base neutralization Accessibility: Keyboard Navigation Bloom’s Level: 2. Understand Difficulty: Easy Gradable: automatic Section number: 04.03 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 70. What is the mass of 4.35 moles of aluminum? A. 0.163 g B. 117 g 24 C. 2.62 × 10 g 22 D. 9.78 × 10 g E. 27.8 g Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.01 Subtopic: Molar Mass Topic: Chemical Calculations 71. Calculate the number of moles of BaF2 in a 10.0 g sample of BaF2. A. 9.77 mol B. 0.115 mol C. 17.4 mol D. 0.0631 mol E. 0.0570 mol Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Easy Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Topic: Chemical Calculations 1-16 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education. 22 72. What is the mass of 3.5 × 10 molecules of CO2? -2 A. 5.9 × 10 g B. 2.6 g 24 C. 1.8 × 10 g -3 D. 1.5 × 10 g E. 3.9 g Accessibility: Keyboard Navigation Bloom’s Level: 3. Apply Difficulty: Medium Gradable: automatic Section number: 04.02 Subtopic: Molar Mass Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations 75. In an acid-base reaction, what is transferred from the acid to the base? A. an electron B. a hydrogen cation, H+ C. an oxidizing agent D. an oxygen atom - E. an OH ion Accessibility: Keyboard Navigation Bloom’s Level: 1. Remember Difficulty: Easy Gradable: automatic Section number: 04.07 Subtopic: Types of Chemical Reactions Topic: Chemical Reactions 1-17 Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education.
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