Equilibrium Whiteboard Review
1)
What is the equilibrium expression
for Kp for the following reaction?
N2 (g) + O2 (g)  2NO (g)
2)
The Keq for the equilibrium below is 5.4 × 1013 at
480.0 °C.
2NO (g) + O2 (g)  2NO2 (g)
What is the value of Keq at this temperature for the
following reaction?
NO2 (g)  NO (g) + ½ O2 (g)
3)
Will there be more products or reactants at
equilibrium?
N2 (g) + 3H2 (g)  2NH3 (g)
Keq = 4.34 × 10-3 at 300 °C
4)
Will there be more products or reactants at
equilibrium?
2SO2 (g) + O2 (g)  2SO3 (g)
Keq = 2.80 × 102 at 999 K
5)
The value of Keq for the equilibrium
N2 (g) + O2 (g)  2 NO (g)
is 4.2 × 10-31 at 27 °C. What is the value of Keq for
the equilibrium below?
4 NO (g)  2 N2 (g) + 2 O2 (g)
6)
Consider the following chemical reaction:
CO (g) + 2H2(g)  CH3OH(g)
At equilibrium in a particular experiment, the
concentrations of CO and H2 were 0.15 M and 0.36 M
respectively. What is the equilibrium concentration of
CH3OH? The value of Keq for this reaction is 14.5 at the
temperature of the experiment.
7)
A reaction vessel is charged with hydrogen iodide, which
partially decomposes to molecular hydrogen and iodine:
2HI (g)  H2(g) + I2(g)
When the system comes to equilibrium at 425 °C,
PHI = 0.708 atm, and PH2 = PI2 = 0.0960 atm.
What is the value of Kp?
8)
Phosphorous trichloride and phosphorous pentachloride
equilibrate in the presence of molecular chlorine
according to the reaction:
PCl3 (g) + Cl2 (g) → PCl5 (g)
An equilibrium mixture at 450 K contains
PPCl3 = 0.224 atm, PCl2 = 0.284 atm, and PPCl5 = 4.24 atm.
What is the value of Kp at this temperature?
9)
For an exothermic reaction, increasing the
reaction temperature results in a(n) ________
in Keq.
10)
If a reaction is endothermic, ________ the
reaction temperature results in an
increase in Keq.
11)
2 POCl3(g)  2PCl3(g) + O2(g)
for which Hrxn = +508 kJ.
How will the equilibrium of the reaction shift
if POCl3 is added to the reaction vessel?
12)
Write the expression for Kc for the following
reaction:
Ti(s) + 2Cl2(g) TiCl4(l)
13)
2 POCl3(g)  2PCl3(g) + O2(g)
Hrxn= +508 kJ
How will the equilibrium of the reaction shift if
only O2 is removed from the reaction vessel?
14)
2SO2(g) + O2(g)  2SO3(g)
H° < 0
How will the equilibrium of the reaction
shift if O2(g) is added to the system?
15)
2SO2(g) + O2(g)  2SO3(g)
H° < 0
How will the equilibrium of the reaction
shift if the reaction mixture is heated?
16)
2SO2(g) + O2(g)  2SO3(g) H° < 0:
How will the equilibrium of the reaction shift
if the volume of the reaction vessel is
doubled?