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ch02 - Chapter 2 Elements Compounds and Chemical Reactions...

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Chapter 2 Elements, Compounds, and Chemical Reactions Multiple Choice Section 2.1 1. How many atoms are there in one formula unit of NiSO 4 7H 2 O? a. 9 b. 14 * c. 27 d. 28 e. 33 Section 2.1 2. Which one of the statements below is true? * Section 2.1 3. The relative number of atoms of each element in a particular compound * Section 2.2 4. A naturally occurring element consists of three isotopes. The data on the isotopes: isotope #1: 46.972 u , 69.472% isotope #2: 48.961 u , 21.667% isotope #3: 49.954 u , 8.8610% What is the average atomic weight of this naturally occurring element? * Section 2.2 20
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5. A naturally occurring element consists of three isotopes. The data on the isotopes: isotope #1: 146.9672 u , 64.792% isotope #2: 148.9638 u , 26.117% isotope #3: 149.9592 u , 9.0910% What is the average atomic weight of this naturally occurring element? a. 49.254 u * b. 147.76 u c. 148.63 u d. 148.67 u e. 147.80 u Section 2.2 6. A naturally occurring element consists of three isotopes. The data on the isotopes: isotope #1: 187.9122 u ., 10.861% isotope #2: 190.9047 u , 12.428% isotope #3: 192.8938 u , 76.711% What is the average atomic weight of this naturally occurring element? * Section 2.2 7. A naturally occurring element consists of three isotopes. The data on the isotopes: isotope #1: 147.9554 u , 10.563% isotope #2: 150.9496 u , 70.811% isotope #3: 152.9461 u , 18.626% What is the average atomic weight of this naturally occurring element? * Section 2.2 8. A naturally occurring element consists of two isotopes. The data on the isotopes: isotope #1 68.5257 u 60.226 % isotope #2 70.9429 u ?????? % Calculate the average atomic mass of this element * 21
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Section 2.2 9. The atomic mass of naturally occurring iron, which is a mixture of isotopes, is listed as 55.847 u . This means that the average mass for the individual iron atoms is a. 55.847 times as great as that of a 12 C atom b. 55.847 times as great as that of a 1 H atom c. 55.847/1.0079 times as great as that of a 1 H atom * d. 55.847/12.000 times as great as that of a 12 C atom e. 55.847/12.011 times as great as that of a 12 C atom Section 2.2
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