Lock AAA AIR Answer each of the following problems in the boxes provided. Show a

Question

Lock AAA AIR Answer each of the following problems in the boxes provided. Show all work, answers only with no work shown will be awarded 0 points. 4. The air pollutant nitrogen monoxide is created by heating air at high temperatures according to the reaction N2 (g) O2 (g) 2NO(g At 1500K, KC A sample of air containing 0.80M of nitrogen and 0.20M of oxygen is heated to 1500K Calculate the equilibrium concentrations of nitrogen, oxygen, and nitrogen monoxide. For each of the following reactions, determine which direction the equilibrium will shift for the given conditions (to the right, to the left, or no shift. Explain your reasoning. 5. P4 (s) 502 (g) Paolo(g) AH a. The total pressure is decreased b. Some oxygen is removed c. The temperature is decreased

Explanation / Answer

1. Kc = [NO]2 / [N2] [O2] = 1 x 10-5

2. By ICE table -

Molarity N2 +   O2 <>2 NO

initial    0.80 0.20 0

change -x -x +2x

equilibrium   0 0.80 - x 0.20-x 2x

Kc = 1.0x 10-5 => [2x]2 / [0.80-x ] [0.20 - x] => [2x]2/ [0.16]

there are 3 cases for quadratic equation for this.

(1) perfect square, (2) simplifying assumption (3) quadratic equation

x = (1.0 X 10-5 (.16)) 1/2 ?/ 4    = 6.3 X 10-4

[N2] = .80 - x = 0.80 - 6.3 X 10-4 = 0.80M

[O2] = -.20 - x = 0.20 - 6.3 X 10-4 = 0.20M

[NO] = 2x = 6.3 X 10-4 X 2 = 1.3 X 10-3M

5. Equilibrium constant for P4(s) + 5O2(g) <--> P4O10(s)  

is K[O2]5 .

Pressure is decreased then == riight direction

Oxygen is removed then moves in left.

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