6. Nitric oxide, an important pollutant in air, is formed from the elements nitr
ID: 877512 • Letter: 6
Question
6. Nitric oxide, an important pollutant in air, is formed from the elements nitrogen and oxygen at high temperatures, such as those obtained when gasoline burns in an automobile engine. At 2000 oC, the K for the following reaction is 0.01.
N2 (g) + O2 (g) « 2 NO (g)
Predict the direction in which the system will move to reach equilibrium at 2000 oC if 0.4 moles of nitrogen and 0.1 moles of oxygen and 0.08 moles of NO are placed in a 1.0 L container. Hint: Calculate Q.
7. Consider the following reaction:
2 HF (g) « H2 (g) + F2 (g) Keq= 1.00 x 10-2
Given 1.00 moles of HF, 0.500 mole of H2 and 0.750 mole of F2 are mixed in a 5.00 L flask, determine the reaction quotient, Q and the net direction to achieve equilibrium. (6 pts)
8. Consider the following equilibrium:
2 NOCl (g) « 2 NO (g) + Cl2 (g)
with an equilibrium constant K = 1.6 x 10-5. If 1.00 mol of pure NOCl and 1.00 mol of pure Cl2 is placed in a 1.00 L container what is the concentration of NO at equilibrium. (use approximation method)
9. At 500 oC the equilibrium constant for the reaction:
H2 (g) + I2 (g) « 2 HI (g)
is 45.0. If 0.300 moles of H2 and 0.300 moles of I2 are placed into a 10.0 L container and allowed to react at this temperature, what are the equilibrium concentrations (mole/liter) of all species? (6 pts)
10. State the effect, if any, of the following changes on the equilibrium position for the reaction: (5 pts)
4 NH3 (g) + 3 O2 (g) 2 N2 (g) + 6 H2O (g) DH = -1,531 kJ
a) increasing the concentration of oxygen
b) adding nitrogen to the equilibrium mixture
c) removing H2O as it is formed
d) increasing the reaction temperature
e) decreasing the total pressure
11. Predict which direction the equilibrium will shift for the following endothermic process, upon the addition of the various stresses listed below. (5 pts)
PCl3 (g) + Cl2 (g) PCl5 (g) DH = 89 kJ
a) add more PCl5 ________________________________
b) decrease the pressure ________________________________
c) remove Cl2 ________________________________
d) add PCl3 ________________________________
e) increase the temperature ________________________________
Explanation / Answer
6. Q = [N2][O2] /[NO]^2
= 0.1*0.4 /0.08^2
= 6.25
q>k SO that N2,o2 converts into No
7.
2 HF (g) « H2 (g) + F2 (g)
kEQ = [HF]^2/ [H2][F2]
= 1^2 / 0.5*0.75
= 2.67
Q>keq so that HF dissociates into H2.F2
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