MCEx2Practice - Chemistry 142 (Practice) MIDTERM EXAM II...

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Chemistry 142 (Practice) M IDTERM EXAM II 2009 November (a) Before starting, please check to see that your exam has 5 pages, which includes the periodic table. (b) Fill in your name, section, and student number on Side 1 of the Answer Sheet . (c) To receive credit, you must mark Test Version B on Side 1 of the answer sheet. (d) When you are done with the exam, hand the Answer Sheet to a TA at the exit of the room. Please take the questions with you. (e) The exam is over at 9:20 AM. No answer sheet will be accepted after 9:20 AM. (e) Our final exam is scheduled for MONDAY, DECEMBER 16 at 8:30 AM in this room.
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Chem 142 Midterm II 2009 November Page 2 To receive credit you must mark version X on side 1 of the Answer Sheet. 1. (10 points) Methane, CH 4 (g) (molar mass = 16.04 g/mol), reacts with steam to give synthesis gas, a mixture of carbon monoxide and hydrogen, which is used as starting material for the synthesis of a number of organic and inorganic compounds. CH 4 (g) + H 2 O(g) o CO(g) + 3 H 2 (g) What mass of hydrogen is formed if 275 L of methane (measured at STP) is converted to synthesis gas? a. 74.2 g b. 12.3 g c. 24.7 g d. 49.4 g e. None of the above 2. (10 points) Which of the following molecular gases effuses most rapidly? a. ammonia b. nitrogen c. oxygen d. hydrogen chloride e. They all effuse at the same rate 3. (10 points) Consider the reaction: CaCl 2 (s) + 2H 2 O(g) CaCl 2 x 2H 2 O(s) The equilibrium constant for the reaction as written as: a. K = 2 2 22 O] [H O] 2H [CaCl x b. K = 2 O] ][H [CaCl O] 2H [CaCl x c. K = 2 2 O] [H 1 d. K = 1 2[H 2 O] e. K = [H 2 O] 2
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Chem 142 Midterm II 2009 November Page 3 4. (10 points) The reaction N 2 (g) + 3H 2 (g) 2NH 3 (g) takes place in a 1.0-L vessel initially filled with an equimolar mixture of N 2 and H 2 at a pressure of 12.0 atm. When equilibrium is reached, the partial pressure of H 2 is 3.0 atm. Determine the value of K p for this reaction. a. 0.030 b. 0.915 c. 0.133 d. 0.333 e. none of these 5. (10 points) Nitric oxide, an important air pollutant, is formed from the elements nitrogen and oxygen at high temperatures, such as those obtained when gasoline burns in an automobile engine. At 2000 q C, K C = 0.01 for the reaction N 2 (g) + O 2 (g) 2NO(g)
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This note was uploaded on 11/02/2011 for the course CHEM 142 taught by Professor Zoller,williamh during the Fall '07 term at University of Washington.

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MCEx2Practice - Chemistry 142 (Practice) MIDTERM EXAM II...

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