Problem set 12
Equilibrium & Redox Reactions
1. Write the equilibrium expression for the follwoing equations:
a) H2(g) + I2(g) ↔ 2 HI(g)
b) 2 SO2(g) + O2(g) ↔ 2 SO3(g)
c) Ca(HCO3)2(s) ↔ CaO(s) + 2 CO2(g) + H2O(g)
d) SnO2(s) + 2 H2(g) ↔ Sn(s) + 2 H2O(g)
2. At a given temperature, an equilibrium mixture of the reaction 2NO(g) + O2(g) ↔ 2NO2(g)
contains 0.090 moles NO, 0.120 moles of O2, and 0.060 moles of NO2 in a 3.00 liter
container. Find the value of K.
3. The following system is at equilibrium. In which direction (right or left) will the
equilibrium position shift with the following changes?
3NO(g) ↔ N2O(g) + NO2(g) + 154.9 kJ
a) Lowering the temperature
b) Raising the temperature
c) Adding more N2O
d) Adding more NO
Dr. Behrang Madani
Chemistry 100
IVC
e) Removing some N2O
f) Adding a catalyst
g) Inreasing the volume
4. 27. The Ksp value for solid Mn(OH)2 is 2×10-13 at 25°C. Calculate the solubility of
Mn(OH)2 in water at 25°C.
5. Find the oxidation state (oxidation number) for each element in the following
molecules/ions.
a) N in NH4MnO4?
b) Mn in NH4MnO4?
c) C in C2H4O2?
d) Xe in XeO42-?
e) S in H2S
f) Fe in FeCl5
6. Given the unbalanced equation below:
Cr2O3(s) + Al(s) → Cr(s) + Al2O3(s)
Dr. Behrang Madani
Chemistry 100
IVC
a. identify the oxidation state of each element
b. identify the oxidizing agent
c. identify the reducing agent
6. Given the unbalanced equation below:
NaOH + Cl2 → NaCl + NaClO + H2O
a. identify the oxidation state of each element
b. identify the oxidizing agent
c. identify the reducing agent
7. Blance each chemical equation using half-reactions method.
a) Cu(s) + HNO3(aq) → Cu(NO3)2(aq) + NO2(g)
b) Cr3+(aq) + Cl1-(aq) → Cr(s) + Cl2(g)
Dr. Behrang Madani
Chemistry 100
IVC