Practice Questions for Exam 2

Practice Questions for Exam 2 - 2 requires 18.45 mL of...

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Practice Questions 1. An ideal gas is heated in a rigid container (so the volume of the gas stays the same). Which of the following is true regarding the change in internal energy of the gas? (A) U < 0 (B) U = 0 (C) U > 0 (D) cannot be determined Answer: C 2. Given the thermochemical equation: 2 HI (g) → H 2 (g) + I 2 (s) ΔH° = −52.96 k J , what is the heat of formation of HI (g), in k J /mol? A) 52.96 B) 26.48 C) −105.92 D) −26.48 E) −52.96 Answer: B 3. In light of the following thermochemical equation, 2 H 2 (g) + O 2 (g) → 2 H 2 O (l) ΔH° = −571.6 k J what volume of H 2 (g), measured at 27°C and 745 torr, must be burned in excess oxygen to release 1000. k J of heat to the surroundings? A) 22.0 L B) 5.21 × 10 −3 L C) 87.9 L D) 44.0 L E) 109 L Answer: C 4. Which of the following has the highest total concentration of ions? A) 0.05 M HBr B) 0.1 M CH 3 OH C) 0.04 M (NH 4 ) 2 SO 4 D) 0.1 M NaCl E) 0.03 M Al 2 (SO 4 ) 3 Answer: D 5. A 25.00 mL sample of an aqueous solution of Ba(OH)
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Unformatted text preview: 2 requires 18.45 mL of 0.01500 M HCl (aq) for its neutralization. What is the molarity of the Ba(OH) 2 solution? A) 0.01107 B) 6.919 C) 5.535 10 3 D) 0.02214 E) 13.84 Answer: C 6. Regarding the following reaction, what statement is incorrect? Mg + Cu 2+ (aq) Mg 2+ (aq) + Cu A) Mg is oxidized. B) Cu 2+ is the oxidizing agent. C) Mg is the reducing agent. D) Cu 2+ is oxidized. Answer: D 7. A sample of hydrogen gas is contained in a balloon. The volume of the balloon is 2.15 L at 15C. The temperature is changed until the volume of the balloon is 3.25 L. What is the new temperature of the gas in C? A) 162 B) 23 C) 82 D) 191 E) 435 Answer: A 8. Calculate the density of ammonia gas, NH 3 , at 24C and 738 torr. A) 0.679 g L 1 B) 1.48 g L 1 C) 0.836 g L 1 D) 514 g L 1 E) 8.38 g L 1 Answer: A...
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This note was uploaded on 05/06/2008 for the course MATH 201 taught by Professor Chuckrow during the Spring '08 term at CUNY City.

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Practice Questions for Exam 2 - 2 requires 18.45 mL of...

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