Final Practice 159

Final Practice 159 - 1. Which of the following can hydrogen...

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1. Which of the following can hydrogen bond with water but not with itself? X. HF Y. NH 3 Z. H 3 COCH 3 A. X only E. X and Z B. Y only F. Y and Z C. Z only G. X, Y, and Z D. X and Y H. none of them 2. Perform the indicated operations and identify the answer with the correct number of significant figures: (33.6567 – 33.575) / (56.1443)(3.6677 x 10 –2 ). A. 0.04 E. 0.03970 B. 0.040 F. 0.03968 C. 0.0400 G. 0.039680 D. 0.0397 H. 0.039676 3. Which of the following is the empirical formula of a compound that is 76.57% C and 6.43% H by mass? A. CHO F. C 2 H 6 O B. CH 2 O G. C 2 H 6 O 3 C. CH 3 O H. C 3 H 3 O D. C 2 H 2 O I. C 6 H 6 O E. C 2 H 4 O J. C 6 H 6 O 3 4. The element antimony has an atomic mass of 121.757 amu and only two naturally occurring isotopes. One isotope has an abundance of 57.300% and has an isotopic mass of 120.904 amu. Based on this data, what is the mass of the other isotope? A. 120.90 amu F. 122.61 amu B. 121.39 amu G. 122.90 amu C. 121.61 amu H. 123.39 amu D. 121.90 amu I. 123.61 amu E. 122.39 amu J. 123.90 amu 5. Consider two elements X and Y. The compound XY 2 has equal masses of X and Y. The ratio of the mass of Y to the mass of X in the compound X 2 Y 5 is A. 0.200 F. 1.20 B. 0.444 G. 1.25 C. 0.800 H. 2.25 D. 0.833 I. 2.50 E. 1.00 J. 5.00 6. The number of atoms in 1.000 mol of aluminum sulfate is A. 6.022 x 10 23 F. 4.818 x 10 24 B. 1.204 x 10 24 G. 6.624 x 10 24 C. 3.011 x 10 24 H. 7.829 x 10 24 D. 3.613 x 10 24 I. 8.431 x 10 24 E. 1.807 x 10 24 J. 1.024 x 10 25
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7. An aqueous solution that is 65.0 % H 2 SO 4 by mass has a density of 1.55 g/mL. What volume of this solution contains 2.00 moles of H 2 SO 4 ? A. 82.3 mL E. 468 mL B. 195 mL F. 625 mL C. 302 mL G. 698 mL D. 375 mL H. 805 mL 8. Magnesium nitride can be formed by the reaction of magnesium metal with nitrogen gas. Which of the following statements is true when 35.00 g of magnesium and 15.00 g of nitrogen gas are mixed and the reaction is allowed to proceed to completion? W. 50.00 grams of magnesium nitride are formed. X. 1.55 grams of N 2 (g) are left over. Y. 13.45 grams of N 2 (g) are left over. Z. Magnesium is in excess. A. W only E. W and X B. X only F. W and Y C. Y only G. W and Z D. Z only H. none of them 9. The density of a gas is 1.76 g/L at a particular pressure and 10 o C. What is its density at 1.5 times this pressure and 20 o C? A.
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This test prep was uploaded on 04/03/2008 for the course CHEM 159-160 taught by Professor Zbaida during the Fall '07 term at Rutgers.

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Final Practice 159 - 1. Which of the following can hydrogen...

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