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Le Chatelier's Principle Practice Problems
1) In the equilibrium reaction:
4HCl(g) + O2(g) ⇆ 2H2O(g) + 2Cl2(g) + 114.4 kJ
Predict the direction of equilibrium shift if the following changes occur.
a) the pressure in increased
b) energy is added
c) oxygen is added
d) HCl is removed
e) a catalyst is added
2) Use Le Chatelier's principle to predict how the changes listed will affect the following
equilibrium reaction:
9.4 kJ + 2HI(g) ⇆ H2(g) + I2(g)
a) What is the effect on the concentration of HI if a small amount of H2 is added?
b) What is the effect on the concentration of HI if the pressure of the system is
increased?
c) What is the effect on the concentration of HI if the temperature of the system is
increased?
d) What is the effect on the concentration of HI if a catalyst is added?
2) Methanol (methyl alcohol) can be manufactured using the following equilibrium
reaction:
CO(g) + 2H2(g) ⇆ CH3OH(g) + energy
Predict the effect of the following changes on the equilibrium concentration of
CH3OH(g).
a) a decrease in temperature
b) an increase in pressure
c) addition of H2(g)
d) addition of a catalyst
2) In the equilibrium reaction:
2NO(g) + O2(g) ⇆ 2NO2(g) + 114.6 kJ
What will be the change in the equilibrium concentration of NO2 under each of the
following conditions?
a) O2 is added
c) energy is added
b) NO is removed
d) a catalyst is added
3) For the following reaction:
N2O4(g) + 58.9 kJ ⇆ 2NO2(g)
How will the equilibrium concentration of NO2 be affected by the following
conditions?
a) an increase in pressure
b) an increase in temperature
c) the addition of a catalyst
4) Suggest four ways to increase the concentration of SO3 in the following equilibrium
reaction:
2SO2(g) + O2(g) ⇆ 2SO3(g) + 192.3 kJ
1)
2)
3)
4)