2005 Mock Exam 3

2005 Mock Exam 3 - CHEM 101, Fall 2005 Mock Exam 3 1. For...

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CHEM 101, Fall 2005 Mock Exam 3 1. For the reaction: C(graphite) + O 2 (g) → CO 2 (g) ∆H 0 f =-393 kJ How many grams of C(graphite) must be burned to release 275 kJ of heat? A. 22.3 g C. 12.0 g B. 0.70 g D. 17.1 g E. 8.40 g 2. For a system undergoing a particular process, q = 20 kJ and w = 15 kJ at constant pressure. Which of the following statements is true? A. Heat flows from the system to the surroundings B. The system does work on the surroundings C. ∆E = 35 kJ D. All of the above are true 3. What is the sign of q for the following process: NaCl(s) → NaCl(l) A. negative, and the process is endothermic B. positive, and the process is endothermic C. negative, and the process is exothermic D. positive, and the process is endothermic 4. Ammonium nitrate can decompose explosively when heated according to the equation: 2 NH 4 NO 3 (s) 2 N 2 (g) + 4 H 2 O(g) + O 2 (g) How many liters of gas would be formed at 450 0 C and 1.00 atm pressure by explosion of 450 grams of NH 4 NO 3 ? A. 208 liters C. 1450 liters B. 2340 liters D. 1167 liters 5. The ΔH fusion for sulfur is 17.7 kJ/mol. How many grams of sulfur can be melted by 29.0 kJ of energy? A. 9.8 g C. 52.5 g B. 26.2 g D. 40.7 g 6. The main composition of dry air at sea level is about 75.5% nitrogen, 23.1% oxygen, and 1.3% argon, by weight. In a 1.00-g sample of dry air at 1.00 atm, calculate the partial pressure of argon gas. A.
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This note was uploaded on 04/08/2008 for the course CHEM 101 taught by Professor Rillings during the Spring '06 term at Clemson.

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2005 Mock Exam 3 - CHEM 101, Fall 2005 Mock Exam 3 1. For...

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