College Chemistry 1A MT#1 (100 pts)

							College Chemistry 210 MT#1 (100 pts)

   1. A sample of 24.0 g of ozone, O3, contains the same number of atoms as
         (a) 58.7 g of nickel
         (b) 27.0 g of aluminum
         (c) 38.0 g of fluorine
         (d) 1.51 g of hydrogen
         (e) 32.0 g of oxygen

   2. What is the percentage of mass of oxygen in vanillin, C8H8O3, which is used as a
      flavoring?



   3. C3H8 + O2  CO2 + H2O (unbalanced) How many grams of oxygen are required
      to burn 18.4 grams of C3H8?

   4. If 100.0 g of O2 are mixed with 100.0 g of H2 and the mixture is ignited, what
      mass of water is produced?

                                          60
   5. How many electrons does the ion       Co3+ have?



   6. An element X has the following isotopic composition: X-200, 90%, X-199,8.0%
      and X-202, 2.0%. Its atomic mass is closest to


   7. The formula for aluminum sulfate is

   8. Choose the name-formula pair that does not match.
         (a) ammonium carbonate (NH4)2CO3
         (b) calcium hydrate CaH2
         (c) sodium chlorate NaClO3
         (d) perchloric acid HClO4
         (e) potassium hydroxide KOH

   9. The area of a 16 in. pizza is 201 in2, express this area in square centimeters
      (given: 1 in = 2.54 cm)
          (a) 31.2
          (b) 125
          (c) 511
          (d) 1.30 x 103
          (e) 5.19 x 103
10. How many iron ions (Fe3+) are present in 166.6 g FeCl3?

11. The density of carbon tetrachloride is 1.59 g/mL. How many moles are present in
    80.0 mL of carbon tetrachloride?

12. Aluminum reacts with oxygen to produce aluminum oxide. If 6.0 moles of Al
    reacts with excess O2, how many moles of Al2O3 can be formed?


13. A mixture of MgCO3 and MgCO3.3H2O has a mass of 3.883 g. After heating to
    drive off all the water the mass is 2.927 g. What is the mass percent of
    MgCO3.3H2O in the mixture?

14. When 1.500 g of a metal oxide is heated, the compound decomposes in the
    reaction shown below. 2 M2O(s)  4 M (s) + O2(g) If 0.1035 g O2 is produced,
    what is the identity of the metal?


15. When a solution of lithium chloride and a solution of ammonium sulfate are
    mixed,
       (a) a precipitate forms
       (b) a new salt is formed
       (c) a gas is evolved
       (d) an acid and a base are formed
       (e) no reaction occurs

16. A precipitation is expected when an aqueous solution of potassium iodide is
    added to an aqueous solution of
       (a) sodium sulfate
       (b) iron(II) chloride
       (c) calcium perchlorate
       (d) lead (II) nitrate
       (e) barium hydroxide
17. Which of the following is a weak electrolyte in aqueous solution?
       (a) H2SO4
       (b) HI
       (c) HNO3
       (d) H2S
       (e) HCl
18. For the reaction Pb(s) + PbO2(s) + 2 H+(aq) + 2HSO4-(aq)  2PbSO4(s) + 2H2O(l)
    The oxidizing agent ( be specific) is
       (a) Pb
       (b) PbO2
       (c) H+
       (d) HSO4-
       (e) PbSO4
19. How much 0.54 M NaCl solution can be prepared via the dilution of 120. mL of a
    12.0 M NaCl solution?

20. Calculate the molarity of the solution that contains 100.0 g of NaOH in 200. mL
    of solution