CHEM+404+Final+Exam

CHEM+404+Final+Exam - University of New Hampshire...

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University of New Hampshire Department of Chemistry Spring Semester 2007 Dr. Charlie Cox CHEM 404: General Chemistry II Final Examination , 45% Select the best answer for each of the following items. Each item is equally weighted at 1 point to give a possible 100 points on the final exam. The exam is cumulative from both semesters and covers all of general chemistry. 1) 1) Determine the volume of hexane that contains 5.33 × 10 22 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol. A) 11.7 mL B) 8.59 mL C) 7.40 mL D) 12.4 mL E) 13.5 mL 2) 2) How many moles of oxygen are formed when 58.6 g of KNO 3 decomposes according to the following reaction? The molar mass of KNO 3 is 101.11 g/mol. 4 KNO 3 (s) ± 2 K 2 O(s) + 2 N 2 (g) + 5 O 2 (g) A) 18.5 mol O 2 B) 23.2 mol O 2 C) 1.73 mol O 2 D) 0.580 mol O 2 E) 0.724 mol O 2 3) 3) What mass (in g) of AgCl is formed from the reaction of 75.0 mL of a 0.078 M AgC 2 H 3 O 2 solution with 55.0 mL of 0.109 M MgCl 2 solution? 2 AgC 2 H 3 O 2 (aq) + MgCl 2 (aq) ± 2 AgCl(s) + Mg(C 2 H 3 O 2 ) 2 (aq) A) 0.839 g B) 1.70 g C) 0.859 g D) 1.72 g E) 2.56 g 4) 4) A mixture of He, Ne and Ar has a pressure of 7.85 atm. If the Ne has a mole fraction of 0.47 and Ar has a mole fraction of 0.23, what is the pressure of He? A) 3.7 atm B) 1.8 atm C) 4.2 atm D) 2.4 atm E) 5.5 atm 1
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5) 5) The following reaction is used to generate hydrogen gas in the laboratory. If 243 mL of gas is collected at 298 K and has a total pressure of 745 mm Hg, what mass of hydrogen is produced? A possibly useful table of water vapor pressures is provided below. Mg(s) + 2 HCl(aq) ± MgCl 2 (aq) + H 2 (g) T (°C) P (mm Hg) 20 17.55 25 23.78 30 31.86 A) 0.0449 g H 2 B) 0.0717 g H 2 C) 0.0190 g H 2 D) 0.0196 g H 2 E) 0.0144 g H 2 6) 6) Determine the total pressure of all gases (at STP) formed when 50.0 mL of TNT (C 3 H 5 (NO 3 ) 3 , d = 1.60 g/mL, molar mass = 227.10 g/mol) reacts according to the following reaction. 4 C 3 H 5 (NO 3 ) 3 (l) ± 6 N 2 (g) + O 2 (g) + 12 CO 2 (g) + 10 H 2 O(g) A) 448 L B) 4.93 L C) 29.6 L D) 57.2 L E) 175 L 7) 7) Place the following gases in order of increasing density at STP. N 2 NH 3 N 2 O 4 Ar A) Ar < N 2 < NH 3 < N 2 O 4 B) N 2 O 4 < Ar < N 2 < NH 3 C) N 2 < Ar < N 2 O 4 < NH 3 D) Ar < N 2 O 4 < N 2 < NH 3 E) NH 3 < N 2 < Ar < N 2 O 4 8) 8) Which of the following is TRUE if E sys = - 95 J? A) The system is gaining 95 J, while the surroundings are losing 95 J. B) The system is losing 95 J, while the surroundings are gaining 95 J. C) Both the system and the surroundings are gaining 95 J. D) Both the system and the surroundings are losing 95 J. E) None of the above are true. 2
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9) 9) Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as gaining heat from the surroundings? A) q
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This note was uploaded on 04/12/2010 for the course CS 1371 taught by Professor Stallworth during the Spring '08 term at Georgia Tech.

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CHEM+404+Final+Exam - University of New Hampshire...

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