Test Bank for General Chemistry 10th Edition by Darrell Ebbing, Steven D. Gammon

Test Bank for General Chemistry 10th Edition by Darrell Ebbing, Steven D. Gammon Test Bank for General Chemistry 10th Edition by Darrell Ebbing, Steven D. Gammon SAMPLE Chapter 3 – Calculations with Chemical Formulas and Equations Chapter 3 – Calculations with Chemical Formulas and Equations 1. The molecular formula of a particular solid is C8H6O8. Its molecular mass is A) 352 amu. B)118 amu. C) 364 amu. D) 230 amu. E) 226 amu. ANS: D PTS: 1 DIF: easy REF: 3.1OBJ: Calculate the formula mass from a formula. (Example 3.1) TOP: stoichiometry | mass and moles of substance KEY: molecular mass MSC: general chemistry 2. The hydrocarbon heptane has the structural formula CH3(CH2)5CH3. What is the molecular mass of this hydrocarbon? A) 100.2 amu. B) 0. amu. C) 86.17 amu. D) 0.01160 amu. E) 110.2 amu. ANS: A PTS: 1 DIF: easy REF: 3.1OBJ: Calculate the formula mass from a formula. TOP: Stoichiometry | mass and moles of substance 3. A single molecule of polystyrene has the repeating unit -[CH2CH(C6H5)]n-, where n is the number of repeating units. What is the value of n if the molecular mass of a single polymer Chain is amu? A) Units. B) Units. C) Units. D) Units. E) Units. ANS: A PTS: 1 DIF: moderate REF: 3.1OBJ: Calculate the formula mass from a formula. TOP: Stoichiometry | mass and moles of substance The formula mass of aluminum oxalate, Al2(C2O4)3, is A) 140 amu. B) 318 amu. C) 283amu. D) 213 amu. E) 185 amu. ANS: B PTS: 1 DIF: easy REF: 3.1OBJ: Calculate the formula mass from a formula. (Example 3.1) TOP: stoichiometry | mass and moles of substance KEY: formula mass MSC: general chemistry 5. The formula mass of zinc acetate trihydrate, Zn(CH3COO)2 • 3H2O, is A) 321 amu. B) 184amu. C) 268 amu. D) 238 amu. E) 114 amu. ANS: D PTS: 1 DIF: easy REF: 3.1OBJ: Calculate the formula mass from a formula. (Example 3.1) TOP: stoichiometry | mass and moles of substance KEY: formula mass MSC: general chemistry 6. The fully hydrated form of sodium sulfate is the decahydrate, Na2SO4 • 10H2O. When heated the hydrated salt loses water. How many water molecules are found per formula unit in a partially dehydrated sample of sodium sulfate with a formula mass of 160.1 amu (i.e. find n for Na2SO4 • nH2O)? A) 1 waters. B) 5 waters. C) 3 waters. D) 4 waters. E) 7 waters. ANS: A PTS: 1 DIF: moderate REF: 3.1OBJ: Calculate the formula mass from a formula. TOP: Stoichiometry | mass and moles of substance 7. What is the molecular mass of cycloheptane, C7H14? A) 13.02 amu B) 1191.19 amu C) 85.08amu D) 98.19 amu E) 26.12 amu ANS: D PTS: 1 DIF: easy REF: 3.1OBJ: Calculate the formula mass from a formula. (Example 3.1) TOP: stoichiometry | mass and moles of substance KEY: molecular massMSC: general chemistry 8. What is the formula mass of strontium phosphate, Sr3(PO4)2? A) 357.83 amu B) 421.83 amu C)182.59 amu D) 715.66 amu E) 452.80 amu ANS: E PTS: 1 DIF: easy REF: 3.1OBJ: Calculate the formula mass from a formula. (Example 3.1) TOP: stoichiometry | mass and moles of substance KEY: formula mass MSC: general chemistry 9. What is the molecular mass of the hydrocarbon styrene (shown in the figure)? A) 104.1 amu. B) 91.1 amu. C) 103.1 amu. D) 13.0 amu. E) 78.1 amu. ANS: A PTS: 1 DIF: easy REF: 3.1OBJ: Calculate the formula mass from molecular models. (Example 3.2) TOP: stoichiometry | mass and moles of substance KEY: molecular massMSC: general chemistry 10. What is the molar mass of ammonium sulfite, (NH4)2SO3? A) 98 g/mol B) 116 g/mol C) 55 g/mol D) 180 g/mol E) 84 g/mol ANS: B PTS: 1 DIF: easy REF: 3.2OBJ: Understand how the molar mass is related to the formula weight of a substance. TOP: stoichiometry | mass and moles of substance KEY: formula mass MSC: general chemistry 11. What is the molar mass of zinc sulfate heptahydrate, ZnSO4 • 7H2O? A) 180. g/mol B) 288 g/mol C) 384 g/mol D) 162 g/mol E) 582 g/mol ANS: B PTS: 1 DIF: easy REF: 3.2OBJ: Understand how the molar mass is related to the formula weight of a substance. TOP: stoichiometry | mass and moles of substance KEY: formula massMSC: general chemistry 12. Plastic wrap can be made from poly(vinylidene chloride). A single poly(vinylidene chloride) strand has the general formula -(CH2CHCl)n-, where n ranges from 10,000 to 100,000. What is the molar mass of a single poly(vinylidene chloride) molecule containing repeating units? A) g/mol B) g/mol C) g/mol D) g/mol E) g/mol ANS: A PTS: 1 DIF: easy REF: 3.2OBJ: Understand how the molar mass is related to the formula weight of a substance. TOP: stoichiometry | mass and moles of substance 13. The dicarboxylic acid potassium hydrogen phthalate (shown in the figure) is used to standardize solutions of strong base. What is the molar mass of this compound? A) 204.2 g/mol B) 192.2 g/mol C) 248.9 g/mol D) 71.08 g/mol E) 172.2 g/mol ANS: A PTS: 1 DIF: easy REF: 3.2OBJ: Understand how the molar mass is related to the formula weight of a substance.TOP: stoichiometry | mass and moles of substance 14. What is the molar mass of the solid C8H12N2O4? A) 172 g/mol B) 136 g/mol C) 200 g/mol D) 106 g/mol E) 188 g/mol ANS: C PTS: 1 DIF: easy REF: 3.2OBJ: Understand how the molar mass is related to the formula weight of a substance.TOP: stoichiometry | mass and moles of substance KEY: molecular massMSC: general chemistry 1021 atoms. 15. What is the element symbol? A) I B) Ag C) La D) Pd E) Rh. A 1.067 g sample of an element contains 5.062 ANS: A PTS: 1 DIF: moderate REF: 3.2OBJ: Understand how the molar mass is related to the formula weight of a substance.TOP: stoichiometry | determining chemical formulas 16. Monodisperse polyacrylonitrile contains molecules with the general formula -(CH2CHCN)n- , where n is typically greater than 10,000. Given that a sample of monodisperse polyacrilonitrile weighs 197.4 g and contains molecules of -(CH2CHCN)n-, calculate n. A) B) C) D) E) ANS: A PTS: 1 DIF: difficult REF: 3.2OBJ: Understand how the molar mass is related to the formula weight of a substance.TOP: stoichiometry | mass and moles of substance 17. Monodisperse polyacrylonitrile contains molecules with the general formula -(CH2CHCN)n- , where n is typically greater than 10,000. Given that a sample of monodisperse polyacrylonitrile weighs 252.6 g and contains molecules of -(CH2CHCN)n-, what is the molar mass of the polymer? A) g/mol B) g/mol C) g/mol D) g/mol E) g/mol ANS: E PTS: 1 DIF: difficult REF: 3.2OBJ: Understand how the molar mass is related to the formula weight of a substance.TOP: stoichiometry | mass and moles of substance 10–23 g. 18. What is the atomic mass of this element in atomic mass units? A) 17.4 amu B) 16.5 amu C) 15.9 amu D) 18.1 amu E) 15.3 amu. An atom of an element weighs 3.00 ANS: D PTS: 1 DIF: easy REF: 3.2OBJ: Calculate the mass of atoms and molecules. (Example 3.3) TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 10–23 g 1025 g 19. What is the mass in grams of one propene, C3H6, molecule? A) 6.99 B) 2.53 C) 44.0 g D) 42.0 g E) 1.99  10–23 g ANS: A PTS: 1 DIF: easy REF: 3.2OBJ: Calculate the mass of atoms and molecules. (Example 3.3) TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 20. What is the mass of oxygen in grams found in one molecule of the compound C7H8O4? A) g B) g C) g D) g E) 156 g ANS: A PTS: 1 DIF: moderate REF: 3.2OBJ: Calculate the mass of atoms and molecules. (Example 3.3) TOP: stoichiometry | mass and moles of substance 21. Which of the following compounds contains the largest number of atoms? A) 4.0 mol ofK2S B) 3.0 mol of NH3 C) 2.0 mol of H2SO4 D) 5.0 mol of HCl E) 1.0 mol of CH3COCl ANS: C PTS: 1 DIF: easy REF: 3.2OBJ: Perform calculations using the mole. TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 23. How many atoms of carbon are there in 0.51 mol of procaine, C13H20N2O2, a “pain killer” used by dentists? A) 6.6 B) 4.3 C) 4.0 D) 6.1 E) 4.6 ANS: C PTS: 1 DIF: easy REF: 3.2OBJ: Perform calculations using the mole. TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 23. A sample of ammonium phosphite, (NH4)3PO3, contains 0.909 mol of hydrogen atoms. The number of moles of oxygen atoms in the sample is A) 0.227 mol. B) 0.0909 mol. C) 0.300 mol. D) 0.227 mol. E) 3.00 mol. ANS: A PTS: 1 DIF: easy REF: 3.2OBJ: Perform calculations using the mole. TOP: stoichiometry | mass and moles of substance 24. A sample of gallium(III) sulfite, Ga2(SO3)3, contains 1.95 mol of sulfite ions. The number of moles of gallium(III) ions in the sample is A) 1.30 mol. B) 2.92 mol. C) 1.95 mol. D) 5.84mol. E) 3.90 mol. ANS: A PTS: 1 DIF: easy REF: 3.2OBJ: Perform calculations using the mole. TOP: stoichiometry | mass and moles of substance 25. Sorbose, C6H12O6, is used in making vitamin C. A sorbose sample containing 96.0 g of carbon atoms also contains ____ g of hydrogen atoms. A) 32.2 B) 16.1 C) 1.15 ´ 103 D) 96.0 E) 7.99 ANS: B PTS: 1 DIF: moderate REF: 3.2OBJ: Perform calculations using the mole. TOP: Stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 26. Consider the following three samples. A. A sample containing 180 g glucose (C6H12O6)B. A sample containing 90 g glucose and 90 g fructose (C6H12O6)C. A sample containing 180 g fructose Which statement is correct? A) All three samples have the same number of hydrogen atoms. B) Both samples A and C have the same number of hydrogen atoms, but more than in sample B. C) Sample B has more hydrogen atoms than sample A or sample C. D) Sample C has more hydrogen atoms than sample A or sample BE) Sample A has more hydrogen atoms than sample B or sample C. ANS: A PTS: 1 DIF: difficult REF: 3.2OBJ: Perform calculations using the mole. TOP: stoichiometry | determining chemical formulas KEY: mole | mole calculations MSC: general chemistry 1021 atoms of hydrogen? 27. Styrene’s empirical formula is CH. What mass of styrene contains 7.89. The molar mass of styrene is 104 g/mol. A) 0.105 g B) 0.170 g C) 1.36 gD) 0.157 g E) 0.0131 g ANS: B PTS: 1 DIF: moderate REF: 3.2OBJ: Convert from moles of substance to grams of substance. (Example 3.4)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 28. What is the mass of oxygen atoms in 0.305 mol Fe (CO)5? A) 17.0 g B) 59.7 g C) 24.4 g D) 4.88 g E) 18.3 g ANS: C PTS: 1 DIF: moderate REF: 3.2OBJ: Convert from moles of substance to grams of substance. (Example 3.4)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 29. What is the mass in grams of 0.699 mol of glucose, C6H12O6? A) 0.00388 g B) 67.1 g C) 126 g D) 21.0 g E) 258 g ANS: C PTS: 1 DIF: easy REF: 3.2OBJ: Convert from moles of substance to grams of substance. (Example 3.4)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 30. Which one of the following samples has the greatest mass? A) 0.39 mol of camphor, C10H16O B) 4.1 mol of ammonia, NH3 C) 9.2 mol of krypton, Kr D) 4.6 mol of iodine vapor, I2 E) 1.8 mol of formaldehyde, CH2O ANS: D PTS: 1 DIF: moderate REF: 3.2OBJ: Convert from moles of substance to grams of substance. (Example 3.4)TOP: stoichiometry | mass and moles of substance KEY: mole | mole MSC: general chemistry 31. Which of the following contains the greatest mass of oxygen atoms? A) 0.6 mol CoSO4 .7H2O B) 2.3 mol KHSO4 C) 1.2 mol K2Cr2O7 D) 2.3 mol H2O2 E) 2.3 mol Na2S2O3 ANS: B PTS: 1 DIF: easy REF: 3.2OBJ: Convert from moles of substance to grams of substance. (Example 3.4)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 32. Calculate the number of moles of bromine present in 14.5 mL of Br2(l), whose density is 3.12 g/mL. A) 3.53 mol B) 0.181 mol C) 0.566 mol D) 0.091 mol E) 0.283 mol ANS: E PTS: 1 DIF: moderate REF: 3.2OBJ: Convert from grams of substance to moles of substance. (Example 3.5)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 33. How many moles of Hexachlorobenzene, C6Cl6, are in 4.45 g of C6Cl6? A) 0.0208 mol B) 1.27103 mol C) 0.0618 mol D) 0.0156 mol E) 0.0322 mol. ANS: D PTS: 1 DIF: easy REF: 3.2OBJ: Convert from grams of substance to moles of substance. (Example 3.5)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 34. How many moles of iron atoms are contained in 4.39 g of iron? A) 245 mol B) 0.0579 mol C)0.0786 mol D) 0.122 mol E) 0.169 mol ANS: C PTS: 1 DIF: easy REF: 3.2OBJ: Convert from grams of substance to moles of substance. (Example 3.5)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 35. How many moles of pentane, C5H12, are contained in a 11-g sample? A) 0.18 mol B) 0.15Mol C) 0.26 mol D) 1.4 mol E) 1.1 mol ANS: B PTS: 1 DIF: easy REF: 3.2OBJ: Convert from grams of substance to moles of substance. (Example 3.5)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 36. Sodium cyclamate, C6H11NHSO3Na, was used at one time as an artificial sweetener. C6H11NHSO3Na has a molecular mass of 201.2 g/mol. How many moles of sodium cyclamate are contained in a 67.6-g sample? A) 0.211 mol B) 0.193 mol C) 0.336 mol D) 0.307 mol E) 13,600mol ANS: C PTS: 1 DIF: easy REF: 3.2OBJ: Convert from grams of substance to moles of substance. (Example 3.5)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry. 37. How many moles of silver are contained in 7.00 kg of silver? 10–1 mol 10–3 mol A) 64.9 mol B) 64.9 C) 64.9 D) 64.9 mol E) 64.9 A PTS: 1 DIF: easy REF: 3.2OBJ: Convert from grams of substance to moles of substance. (Example 3.5)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 1024 atoms. 1023 atoms. E) 1.03  1022 atoms. D) 2.48  1022 molecules. C) 4.96  1023molecules. B) 2.48 38. A 0.0103-mol sample of urea, NH2CONH2, contains A) 6.02 ANS: C PTS: 1 DIF: easy REF: 3.2OBJ: Calculate the number of molecules in a given mass of substance. (Example 3.6)TOP: stoichiometry | mass and moles of substance KEY: mole | mole calculations MSC: general chemistry 39. How many molecules are there in 90.0 g of butylene glycol, HO(CH2)4OH?A) 1B) (6. 1023) E) 6.02  (6.02  1023)/90.0C) 90.0D) 90.0  ANS: E PTS: 1 DIF: easy REF: 3.2OBJ: Calculate the number of molecules in a given mass of Substance?