Problem Set 11
(Due November 14)
Name_______________________________
Suggested Book Problems: 15.27, 15.29, 15.31, 15.33, 15.35, 15.37, 15.39, 15.45, 15.47, 15.49,
15.53, 15.55, 15.67, 15.69, 15.71, 15.73, 15.73, 15.93
1. Determine the oxidation number of each element in the following compounds:
Cr2O3
CrO4-1
BaCrO4
CrF5
Cr2O72-
AlCl4-1
NaOH
BH4-1
2. Determine if each reaction is a redox or non-redox reaction:
2 NO + O2  2 NO2
CO2 + H2O  H2CO3
Zn + 2 AgNO3  Zn(NO3)2 + 2 Ag
HNO3 + NaOH  NaNO3 + H2O
3. For each of the following, identify which atom is oxidized, which atom is reduced, the oxidizing agent,
and the reducing agent.
Zn + CuCl2  ZnCl2 + Cu
H2S + HNO3  S + NO
NiS + O2 2 NiO + 2 SO2
4. Balance the following reactions using the half reaction method:
NH3 + ClO-1  N2H4 + Cl-1
Cr(OH)2 + BrO-1  Br-1 + CrO42Al + H3PO4  PH3 + AlO2-1
5. Consider the following redox reaction:
NO (g) + MnO4-1 (aq)  NO3-1 (aq) + MnO2 (s)
a. What is the name of MnO2?
b. Balance the reaction
c. If 1 mole of MnO4-1 reacts with excess NO, determine the total number of electrons that will be
transferred to the oxidizing agent.
d. If 1.3 L of 3.4 M KMnO4 reacts with 14 L of NO at STP, determine the mass of MnO2 that will be
formed.
6. Consider the combustion of glucose (C6H12O6).
a. Write a balanced reaction using the standard approach.
b. Confirm that this is a redox reaction by determining oxidation states of all atoms.
c. What is the oxidizing agent?
d. Balance this redox reaction using the half reaction method.
e. If 10 grams of glucose is consumed, determine the total number of electrons that are transferred
to oxygen.
4. 2NH3 + ClO-1  N2H2 + Cl-1 + H2O
Cr(OH)2 + 2BrO-1  CrO4-1 + Br-1 + 2H+
3H3PO4 + 4H2O + 8Al  8AlO2-1 + 8 H+ + 3 PH3
5. c. 2.4 x 1024 electrons
5d. 54.34 g MnO2
6.e. 1.34 x 1023 electrons