Please show work 1

Subject:ChemistryPrice: Bought3

Share With

Please show work

1. Calculate the equilibrium constant for the following reaction at 25 degrees Celsius.

Fe2+(aq) + 2Ag(S) = Fe(s) + 2Ag+(aq)

• Fe2++2e- -----> Fe (solid) E0/V= -0.44
• Ag++e- -----> Ag (solid) E0/V= 0.80

A) 2 x 10-30

B) 1.5 x 10-39

C) 4.1 x 10-49

D) 1 x 10-42

2. Calculate DG0 for the following reaction at 25 degrees Celsius.

2Al3 (aq) + 3Mg(s) = 2Al(s) + 3Mg2+(aq)

A) -4.1 x 102 KJ/mol

B) -5.1 x 102 KJ/mol

C) -6.1 x 102 KJ/mol

D) -3.1 x 102 KJ/mol

3. Will the following reaction occur spontaneously at 25 degrees Celsius, given that [Fe2+] = 0.60 M and [Cd2+] = 0.010 M?

Cd(s) + Fe2+(aq) → Cd2+(aq) + Fe(s)

A) No, E = +0.04 V

B) Yes, E = +0.04 V

C) Yes, E = +0.01 V

D) No, E = +0.01 V

4. The E0cell for the following cell is 1.54 V at 25 degrees Celsius.

U(s) / U3+ // Ni2+/ Ni(s)

A) +1.79 V

B) -1.20 V

C) +1.20 V

D) -1.79 V

5. Calculate the emf of the following concentration cell: Mg(s) /Mg2+(0.24)//Mg2+(0.53M) /Mg(s)

A) 0.030 V

B) 0.010 V

C) 0.040 V

D) 0.020V

6.An aqueous solution of Mg(NO3)2 is electrolyzed. What are the gaseous products at the anode and cathode?

A) Anode, O2; Cathode, H2

B) Anode, H2; Cathode, O2

C) Anode, NO3; Cathode, O2

D) Anode, ,H2; Cathode, NO3

7. A constant current is passed through an electrolytic cell containing molten MgCl2 for 18 h. If 4.8 x 105 g of Cl2 are obtained, what is the current in amperes?

A) 3 x 104 A

B) 4 x 104 A

C) 2 x 104 A

D) 1 x 104 A

8. If the cost of electricity to produce magnesium by the electrolysis of molten magnesium chloride is $155 per ton of metal, what is the cost of the electricity necessary to produce 10 tons of aluminum?

A) $1230

B) $3023

C) $5213

D) $ 2325

9. In the electrolysis of an aqueous AgNO3 solution, 0.67g of Ag is deposited after a certain period. Calculate the number of electricity used in coulombs.

A) 400 C

B) 600 C

C) 300 C

D) 500 C

10. A quantity of 0.300 g of cupper was deposited from a CuSO4 solution by passing a current of 3.00 A through the solution for 304 s. Calculate the value of the Faraday constant.

A) 8.51 x 104 C

B) 7.43 x 104 C

C) 9.66 x 104 C

D) 6 25 x 104 C