Chapter 3 - Chapter 3: (3 points each) 1. There are two...

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Chapter 3: (3 points each) 1. There are two stable isotopes of chlorine: chlorine-35, with a mass of 34.968853 amu; and chlorine-37, with a mass of 36.965903. Given that the average atomic mass of a chlorine atom is 35.45 amu, which of the following statements is true? (Section: 3.1) A) Chlorine contains almost exclusively of 35 17 Cl , with very little 37 17 Cl. B) Chlorine contains more 35 17 Cl than 37 17 Cl. C) Chlorine contains roughly equal amounts of 35 17 Cl and 37 17 Cl. D) Chlorine contains more 37 17 Cl than 35 17 Cl. E) Chlorine contains almost exclusively of 37 17 Cl, with very little 35 17 Cl. Answer : D) Chlorine contains more 37 17 Cl than 35 17 Cl. 2. If 0.274 moles of a substance weighs 62.5 g, what is the molar mass of the substance, in units of g/mol? (Section: 3.2) A) 2.28 × 10 2 g/mol D) 2.17 × 10 2 g/mol B) 1.71 × 10 1 g/mol E) none of these C) 4.38 × 10 –3 g/mol Answer : A) 2.28 × 10 2 g/mol 3. One mole of iron (Section: 3.2) A) is heavier than one mole of lead (Pb). D) weighs the same as one mole of lead. B) is 77.0 g of iron. E) None of the above. C) is 26.0 g of iron. Answer : D) weighs the same as one mole of lead. 4. Determine the number of moles of aluminum in 96.7 g of Al. (Section: 3.2) A) 0.279 mol B) 3.58 mol C) 7.43 mol D) 4.21 mol E) 6.02 × 10 23 mol Answer: B) 3.58 mol 5. How many atoms are in 5.54 g of F 2 ? (Section: 3.3) A) 6.02 × 10 23 atoms D) 8.78 × 10 22 atoms B) 0.146 atoms E) 1.76 × 10 23 atoms C) 0.292 atoms Answer : E) 1.76 × 10 23 atoms Page 39
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Chapter 3 - Chapter 3: (3 points each) 1. There are two...

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