Chemical Principles 8th Edition by Steven S. Zumdahl
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Chapter_03_Stoichiometry 1. Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes. An atom of bromine-79 contains a. 79 protons, 79 electrons, and 35 neutrons. b. 35 ... protons, 44 neutrons, and 35 electrons. c. 44 protons, 44 electrons, and 35 neutrons. d. 34 protons and 35 electrons only. e. 35 protons, 79 neutrons, and 35 electrons. 2. The average mass of a boron atom is 10.81. If you were able to isolate a single boron atom, what is the chance that you would randomly get an atom with mass 10.81? a. greater than 50% b. 0% c. 0.81% d. 10.81% e. about 11% 3. For a new element, 60.54% is an isotope with mass 282.1 amu, 3.28% is an isotope with mass 283.2 amu, and 36.18% is an isotope with mass 284.6 amu. Calculate the average atomic mass of this new element. a. 283.3 amu b. 849.9 amu c. 282.1 amu d. 283.0 amu e. 314.5 amu [Show More]
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