CHEMISTRY 102 HWKTEST#5[g]
CURRENT DATE and TIME

For the reaction system



N₂O₄(g) 2NO₂(g)



At a given temperature, K_p = 9.4. For this reaction system, it is found that the pressure of N₂O₄ is 3.5 x 10^-2 atm at equilibrium. What is the pressure of NO₂?

Your answer:
0.035 atm
0.57 atm
0.99 atm
0.33 atm
0.66 atm


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Dinitrogen tetroxide readily undergoes decomposition to form red-brown NO₂(g), as represented by the equation



N₂O₄(g) 2NO2(g)



At 25°C, 0.11 mol N₂O₄ reacts to form 0.10 mol N₂O₄ and 0.02 mol NO₂. At 90°C, 0.11 mol N₂O₄ forms 0.050 mol N₂O₄ and 0.12 mol NO₂. From these data, we can conclude that



1. N₂O₄ molecules react by a first-order rate law.
2. the reaction is endothermic.
3. the equilibrium constant for the reaction increases with an increase in temperature.

Your answer:
1 and 2 only
3 only
2 only
2 and 3 only
1 only


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For which of the following systems at equilibrium and at constant temperature will decreasing the volume cause the equilibrium to shift to the right?

Your answer:
2NH₄Cl(s) 2NH₃(g) + HCl(g)

N₂(g) + 3H₂(g) 2NH₃(g)

2H₂O(g) 2H₂(g) + O₂(g)

2NO₂(g) 2NO(g) + O₂(g)

H₂(g) + Cl₂(g) 2HCl(g)


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For the reaction system H₂(g) + I₂(g) 2HI(g), K = 55 at 425°C. For the system HI(g) (1/2)H₂(g) + (1/2)I₂(g), K at 425°C is

Your answer:
0.018
3.3 x 10^-4.
-55.
55.
0.13.


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The oxidation of carbon monoxide proceeds as follows:



2CO(g) + O₂ 2CO₂(g)                ΔH_r° = -559 kJ



Which of the following will cause and INCREASE in the equilibrium concentration of CO?

Your answer:
decreasing the temperature of the system
adding more O₂ to the system
adding a catalyst
removing CO₂ from the system as it is formed
decreasing the pressure of the system at constant temperature


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At a given temperature, for the reaction



SO₂(g) + NO₂(g) SO₃(g) + NO(g)



K_f = 25. If 1.00 mol each of SO₃ snd NO are placed in a 1.00-L container, what is the concentration of SO₃ at equilibrium?

Your answer:
0.075 M
0.017 M
0.025 M
0.065 M
0.083 M


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For which of the following reactions are the numerical values of K_p and K_c the same?



1. 2SO₂(g) + O₂(g) 2SO₃(g)
2. 2N₂(g) + O₂(g) 2NO(g)
3. H₂(g) + I₂(g) 2HI(g)

Your answer:
2 and 3 only
2 only
3 only
1 and 2 only
1, 2, and 3


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