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Fall 2009 Exam 1 Practice ii Zumdahl Chapters 3,4,12,13_ no answer key

# Fall 2009 Exam 1 Practice ii Zumdahl Chapters 3,4,12,13_ no answer key

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Practice Exam 1ii (Zumdahl Chapters 3,4,12,13) Page 1 1. Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes. An atom of bromine-79 contains A) 35 protons, 44 neutrons, and 35 electrons. B) 34 protons and 35 electrons only. C) 44 protons, 44 electrons, and 35 neutrons. D) 35 protons, 79 neutrons, and 35 electrons. E) 79 protons, 79 electrons, and 35 neutrons. 2. Which compound has the smallest molar mass? 3. Calculate the molar mass of a sample if a single molecule weighs 5.34 x 10 -23 g. 4. The empirical formula of styrene is CH; its molar mass is 104.1. What is the molecular formula of styrene? 5. The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium- 185, what is the other stable isotope? A) 183 75 Re B) 187 75 Re C) 189 75 Re D) 181 75 Re E) 190 75 Re

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