Chapter 2b notes - CHM 1025 Chapter 2 Part B 1. Atomic Mass...

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Chapter 2 Toyota 1 CHM 1025 Chapter 2 Part B 1. Atomic Mass a. Mass spectrometry is used to determine the mass-to-charge ratio of atoms i. 1 H has a mass of 1.67380 x 10 -24 g ii. 12 C has a mass of 1.99272 x 10 -23 g 1. Ratio is about 1:12 b. Atomic Mass Unit (amu) is equal to 1/12 th the mass of a carbon-12 atom i. This scale makes it easy to compare masses of atoms ii. So 35 C has a mass of 35 and 37 Cl has a mass of 37 c. Calculating relative atomic masses i. 37 Cl (36.9659 amu) is 24.23% of all naturally occurring Cl ii. 35 Cl (34.9689 amu) is 75.77% of all naturally occurring Cl 1. What is the average atomic mass of Cl? Isotope Mass x abundance (as a decimal) Mass contribution 37 Cl 35 Cl Relative atomic mass of Cl iii. Silver has an atomic mass of 107.87 amu and has two naturally occurring isotopes, 107 Ag and 109 Ag. The masses of these isotopes are 106.90509 amu and 108.90476 amu, respectively. What is the percent abundance of 109 Ag? 1) 35.8% 2) 48.3% 3) 40.0% 4) 51.5% 5) 65.2% 2. The Periodic Table a. Organization of elements i. 1789, Lavoisier identified thirty-three elements and placed them into four categories: gases,
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Chapter 2b notes - CHM 1025 Chapter 2 Part B 1. Atomic Mass...

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