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practiceexam5 - City College Chemistry Department Chemistry...

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City College, Chemistry Department Chemistry 10301, sections L and L2, Prof. T. Lazaridis First Midterm exam, Sep. 26, 2000 Name (last name first): ___________________________________ I.D. Number: ____________________________________________ Workshop leader: ________________________________________ Note: There are 6 questions in this exam (check both sides of the sheet). Fill in your answer in the blank space provided immediately following each question. One point will be subtracted every time you report a numerical result with an incorrect number of significant figures. For some questions you may need to consult the periodic table posted in the classroom. Good luck! Molar masses (in g/mol): C: 12.01, H: 1.008 , O: 16.00 Al: 26.98 1. a. (4) What is the formula of ammonium sulfate? (NH 4 ) 2 SO 4 b. (4) What is the mass of one mole of ethyl alcohol (C 2 H 6 O) ? 2 X 12.01 + 6 X 1.008 + 16.00 = 46.07 g/mol c. (4) How many protons and electrons does the Fe(III) ion have? 26 protons, 23 electrons d. (4) An element has been found to have a molar mass of about 40 g/mol. Write the name and the symbol of that element. Calcium (Ca) or Argon (Ar) e. (4) Write the atomic symbols of the elements Chlorine, Phosphorus, Copper, and Sodium.
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