Answer to Question #212231 in General Chemistry for Ojeda

Question

Activity 7.2

Balance the reactions below using the change in oxidation number method.

1. PbO2 + HBr PbBr2 + O2 + H2O
2. PbO + NH3 Pb + N2 + H2O
3. KBr + KClO2 + H2SO4 Br2 + KCl + K2SO4 + H2O
4. Br- + ClO- + H+ Br2 + Cl- + H2O
5. Sn2+ + VO43- + H+ Sn4+ + V2+ + H2O

Answer 1

1.2PbO2 + 4HBr –> 2PbBr2 + O2 + 2H2O

2.$3PbO+2NH 3 ​ →3Pb+3H 2 ​ O+N 2 ​$

3.4KBr + KClO2 + 2H2SO4 → 2Br2 + KCl + 2K2SO4 + 2H2O

4.ClO- + 2Br- + 2H+ → Br2 + Cl- + H2O

5. 5Sn2+. (aq) → 5 Sn4+. (aq) + 10 e-. 2 MnO4. - + 5 Sn2+ + 16 H+→ 2 Mn2+ + 5 Sn4+ + 8 H2O.