Exam-2-C - Fall 2010 CHEMISTRY 104 Section 001 Exam 2 Name...

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Unformatted text preview: Fall 2010 CHEMISTRY 104 Section 001 Exam 2 Name: ______________________ ID: XXX-XX-_ ______ Seat #: ___ 1. The reaction ¡¢¢£ has K p = 45.9 at 763 K. A particular equilibrium mixture at that temperature contains gaseous HI at a partial pressure of 4.00 atm and hydrogen gas at a partial pressure of 0.273 atm. What is the partial pressure of I 2 ? A) 10.7 atm B) 0.273 atm C) 1.28 atm D) 58.6 atm E) 0.319 atm 2. At 500.0 K, one mole of gaseous ONCl is placed in a one-liter container. At equilibrium it is 5.1 % dissociated according to the equation shown here: 2ONCl ¡¢¢£ 2NO + Cl 2 . Determine the equilibrium constant. A) 9.5 × 10-1 B) 7.4 × 10-5 C) 5.4 × 10-2 D) 1.4 × 10-3 E) 1.4 × 10 4 Use the following to answer questions 3-4. Determine whether the following oxides produce A) an acidic solution when dissolved in water:, B) a basic, solution when dissolved in water, C) a neutral solution when dissolved in water: Page 1 3. SO 2 4. K 2 O 5. A 0.50-mol sample of a diprotic acid, H 2 A, is dissolved in 250 mL of water. The K of this acid is 1.0 × 10-5 and K is 1.0 × 10-10 . Calculate the concentration of A 2- in this solution. A) 1.0 × 10-10 M B) 4.5 × 10-3 M C) 2.2 × 10-3 M D) 2.00 M E) 1.0 × 10-5 M 6. A 3.00-liter flask initially contains 1.50 mol of gas A and 0.450 mol of gas B. Gas A decomposes according to the following reaction: 3A ¡¢¢£ 2B + C The equilibrium concentration of gas C is 0.122 mol/L. Determine the equilibrium concentration of gas B. A) 0.122 M B) 0.394 M C) 0.134 M D) 0.272 M E) none of these 3. SO 2 4. K 2 O 5. A 0.50-mol sample of a diprotic acid, H 2 A, is dissolved in 250 mL of water. The K of this acid is 1.0 × 10-5 and K is 1.0 × 10-10 . Calculate the concentration of A 2- in this solution. A) 1.0 × 10-10 M B) 4.5 × 10-3 M C) 2.2 × 10-3 M D) 2.00 M E) 1.0 × 10-5 M 6. A 3.00-liter flask initially contains 1.50 mol of gas A and 0.450 mol of gas B. Gas A decomposes according to the following reaction: 3A ¡¢¢£ 2B + C The equilibrium concentration of gas C is 0.122 mol/L. Determine the equilibrium concentration of The equilibrium concentration of gas C is 0....
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Exam-2-C - Fall 2010 CHEMISTRY 104 Section 001 Exam 2 Name...

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