Chemistry 1202 Final

Chemistry 1202 Final - 1. Consider the following...

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1. Consider the following thermodynamic information for the vaporization of carbon tetrachloride, CCl 4 : C C l 4 ( l ) ' CCl 4 (g); ' H o = 32.6 kJ/mol; ' S o = 95.0 J/K E s t i m a t e t h e n o r m a l b o i l i n g p o i n t ( i n °C ) of CCl 4 . A) 0 °C B) 100 °C C) ± 270 °C D) 340 °C E) 70 °C 2. Oxygen difluoride reacts with water according to the following equation. O F 2 (g) + H 2 O(g) Æ O 2 (g) + 2 HF(g) Using the enthalpies of formation below, calculate the amount of heat energy involved when 50.0 g of OF 2 reacts completely with excess water. Compound ' H o f (kJ/mol) OF 2 (g) +17.6 HF(g) ± 271.1 H 2 O(g) ± 241.8 A) 318 kJ were absorbed B) 294 kJ were absorbed C) 294 kJ were released D) 318 kJ were released E) 43.2 kJ were released 3. Calculate ' H o for the reaction C 2 H 4 (g) + H 2 O(g) ĺ C 2 H 6 O(g) from the following information: 2H 2 O(g) ĺ 2H 2 (g) + O
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A) ± 46 kJ B) +744 kJ C) +222 kJ D) ± 274 kJ E) ± 106 kJ 4. A 36.5 g sample of solid KBr is dissolved in 100. g of water at 28 o C. What is the final temperature of the solution assuming no heat escapes into the surroundings? The specific heat of this mixture is 4.18 J/g-K, and the enthalpy of dissolving for KBr is +19.9 kJ/mol. A) 27.6 o C B) 10.1 o C C) 17.3 o C D) ²³´µ o C E) 4.3 o C 5. Which of the following processes is expected to have a positive change in entropy ( ' S > 0)? A) 32 g of solid copper metal cools from 55 o C to 25 o C B) Br 2 (l) Æ Br 2 (s) C) Pb(NO 3 ) 2 (aq) + 2 KBr(aq) Æ PbBr 2 (s) + 2 KNO 3 (aq) D) Ag + (aq) + Cl ± (aq) Æ AgCl(s) E) P 4 (g) Æ 2 P 2 (g)
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6. A mixture of 1 atm N 2 , 1 atm H 2 O, 1atm NO , and 1 atm H 2 , is placed into a closed container at 500. K. The mixture is allowed to go to equilibrium. N 2 (g) + 2 H 2 O(g) 2 NO(g) + 2 H 2 (g) ' H o f , kJ/mol S o , J/mol-K NO +90.37 210.62 H 2 O ± 241.82 188.83 H 2 130.58 N 2 191.50 Which of the following statements is correct? A) At equilibrium the partial pressure of H 2 is greater than the partial pressure of H 2 O. B) The initial mixture was at equilibrium and the partial pressures remain at 1 atm. C) ' S is positive so the reaction goes spontaneously towards products. D) At equilibrium the partial pressure of N 2 is greater than the partial pressure of NO . E) . p is a large number so the equilibrium mixture will consist of mostly products with only small amounts of reactants present. 7. The processes below take place at constant pressure in a container where heat can flow between the system and the surroundings. Which of these processes will have a positive entropy change in the surroundings? A)
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Chemistry 1202 Final - 1. Consider the following...

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