1).Balance the following redox reactions: a) H2S + HNO3àS + NO (acidic solution)

Question

1).Balance the following redox reactions:

a) H2S + HNO3àS + NO (acidic solution)

b) MnO4^- + I^- àMnO2+ IO3^–(basic solution)

2). Calculate E °cell for the following redox reaction:

2Fe^2+(aq) + Cd^2+(aq) à 2Fe^3+(aq) + Cd(s)

3). Calculate E ° cell for the following electrochemical cell: Ni(s) | Ni^2+(aq) || Hg2^2+(aq) | Hg(l) | Pt(s)

4).Calculate Delta G °(kJ/mol) for the following electrochemical cell:

Pb(s) | Pb^2+(aq) || Fe^3+(aq) | Fe^2+(aq) | Pt(s)

5).Determine the equilibrium constant for the following redox reaction at 25 °C: 2I^–(aq) + Br2(l)<--->I2(s) + 2Br^–(aq). Is the reaction spontaneous in the forward direction?  

Explanation / Answer

1.

a) 3 H2S + 2 HNO3 = 3 S + 2 NO + 4 H2O

b) 2 MnO4- + I- + H2O = 2 MnO2 + IO3- + 2 OH-

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