Reference no: EM13585231

1. Predict the potential for the following voltaic cell at 25 C:

Cu(s)|CuSO₄(1.09 M)||AgNO₃(0.43 M)|Ag(s)

(Answer must be in volts)

2. Suppose a 4-volt battery is delivering a steady current of 4 A for a period of 2 hours. Calculate the total charge in coulombs that passes through this circuit.

( answer must be in coulombs )

3. Use a table of standard thermodynamic values to predict the standard cell potential at 55 C:

Cu(s)|CuSO₄||AgNO₃|Ag(s)

Assume that the values of ΔH and ΔS are independent of temperature.

( answer must be in volts )

4. A steel railroad bridge uses a zinc sacrificial anode to limit the extent of oxidation of the steel. If a 9.7 kg anode is completely ozidized to Zn²⁺ over the course of 16.2 years, compute the average current flowing through the anode.

(answer must be in Amperes )

5. Someday, cars may be powered by clean H₂/O₂ fuel cells and electric motors. Under standard conditions, such a fuel cell can develop 1.229 volts. If the oxygen is obtained from air (at P=0.21 bar), what pressure of H₂ would be required to develop 1.228 volts from the cell at 25 C?

(answer must be in bar )

6. At 25 C, the standard hydrogen electrode (SHE) has a half-cell potential that is defined to be 0.00 volts. If the pH is increased at this electrode (keeping everything else the same), at what pH will the half-cell potential be equal to -0.244 volts?

7. Two standard reduction potentials for an unknown metal oxide are:

MO₂⁺ → MO⁺ E₀=0.1035 v

MO₂⁺ → M²⁺ E₀=0.161 v

Complete the reduction potential diagram for this system by calculating the standard half-cell reduction potential for MO⁺ → M²⁺

(answer must be in volts )