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Chem_2080_Problem Sets 2009

# Chem_2080_Problem Sets 2009 - equation 2HI(g H 2(g I 2(g K...

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Chemistry 2080 Spring 2009 Problem Set #5 - due date: Friday, March 6th at 2 pm Name:________________ Lab TA Name:__________________ Lab Day/Time:______________________ Practice problems (not graded). Chapter 15: 7, 11, 13, 15, 17, 29, 31, 33, 37, 39, 51 1) For each of the following reactions, calculate K p from K c (a) N 2 (g) + 3H 2 (g) 2NH 3 (g) K c = 3.5 x 10 8 at 25 °C (b) 2H 2 (g) + O 2 (g) 2H 2 O(g) K c = 3.2 x 10 81 at 25 °C (c) N 2 (g) + O 2 (g) 2NO(g) K c = 1.7 x 10 –3 at 2300 K (d) 2NO 2 (g) N 2 O 4 (g) K c = 1.7 x 10 2 at 25 °C 2) One way to generate hydrogen gas is to react carbon monoxide with steam: CO(g) + H 2 O(g) CO 2 (g) + H 2 (g) K c = 10.0 at 420 °C Suppose you put 2.5 x 10 –3 mol/L CO and 2.5 x 10 –3 mol/L H 2 O in a container and heat the mixture to 420 °C. What is the concentration of each of the four substances when equilibrium is reached?

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3) Hydrogen iodide gas, when heated to 745 K, decomposes partially to its elements according to the following
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Unformatted text preview: equation: 2HI(g) H 2 (g) + I 2 (g) K c = 0.0200 (at 745 K) Suppose that a mixture of 1.00 mol HI(g) and 1.00 mol H 2 (g) is sealed into a 10.0 L flask and heated to 745 K. What will be the concentrations of all three substances when equilibrium is achieved? 4) Consider an equilibrium mixture of nitrogen, hydrogen and ammonia: N 2 (g) + 3H 2 (g) 2NH 3 (g) Δ H° = –92.2 kJ at 25 °C For each of the changes listed below, say whether the value of K c increases or decreases, and say whether more NH 3 , or less NH 3 is present at the new equilibrium that is established after the change. (a) More H 2 is added (at a constant temperature of 25 °C and constant volume) (b) The temperature is increased. (c) The volume of the container is doubled (at constant temperature)....
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