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

Fall 2009 Exam 1 - Practice Exam 1ii(Zumdahl Chapters 3,4,12,13 1 Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes An

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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? A) C 2 H 4 O B) CO 2 C) CH 3 Cl D) C 2 H 6 E) none of these 3. Calculate the molar mass of a sample if a single molecule weighs 5.34 x 10 -23 g. A) 1.13 x 10 46 g/mol B) 12.0 g/mol C) 5.34 x 10 -23 g/mol D) 32.2 g/mol E) none of these 4. The empirical formula of styrene is CH; its molar mass is 104.1. What is the molecular formula of styrene? A) C 2 H 4 B) C 8 H 8 C) C 10 H 12 D) C 6 H 6 E) none of these 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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Practice Exam 1ii (Zumdahl Chapters 3,4,12,13) Page 2 6. What volume of 12.0 M HCl is required to prepare 16.0 L of 0.250 M hydrochloric acid? A) 130. mL
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This note was uploaded on 11/30/2009 for the course CHEM 1101 taught by Professor Bottomley during the Fall '08 term at Georgia Institute of Technology.

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Fall 2009 Exam 1 - Practice Exam 1ii(Zumdahl Chapters 3,4,12,13 1 Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes An

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