Voltaic Cell Help! I am having trouble with numbers 18 and 19, the rest I unders
ID: 926989 • Letter: V
Question
Voltaic Cell Help! I am having trouble with numbers 18 and 19, the rest I understand. The practice test gives us the answers but I do not understand how to find them. Thanks! Consider the following voltaic cell constructed from a Iron electrode dipped in an aqueous solution of Fe(NOs) eles tuds are us toletrede dipmped in n aqucous Tarno) soniven that the reduction potentiaks of the electrodes are as follows: E%dFe''Fe) =-0.036 V and Eond LayLa)--238 V, answer the nexrAve questions Voltmeter La Fe La3+ Fe3+ 15. Which electrode operates at the anode and which direction does the electrons flow in the figure above? a) The Fe"/Fe half cell represents the anode and electrons flow from left to right in this figure. b) The Fe"/Fe half cell represents the anode and electrons flow from right to left in this figure. c) The La /La half cell represents the anode and electrons flow from left to right in this figure. d) The La"La half cell represents the anode and electrons flow from right to left in this figure. Which metal electrode will expand as electricity flows through this cell and which ion from the salt bridge (Na" or SO) will flow into this half cell aqueous solution? 16. a) The Iron electrode will expand as electricity flows through the cell and Na ions from the salt bridge will migrate into this half-cell. b) The Iron electrode will expand as electricity flows through the cell and SO ions from the salt bridge will migrate into this half-cell. c) The Lanthanum electrode will expand as electricity flows through the cell and Nat ions from the salt bridge will migrate into this half-cell. d) The Lanthanum electrode will expand as electricity flows through the cell and SO ions from the salt bridge will migrate into this half-cell. 17. What is the standard cell potential of this voltaic cell, E cel When electrons flow spontaneously? a) -7.25 V and the molar concentration of La3 is 2.6 x 103 M at 298 K? a) 2.29 v involving the Iron and the Lanthanum electrodes at 25 ? b) -2.34 V c) 0.086 V d) 2.34 V e) -2.42 V is 7.9 x 10 M 18. What would be the non-standard cell potential, Ecell if the molar concentration of Fe b) 2.39 V c) 2.45 V d) 0.13 V 0.20 V value of the standard Gibbs Free Energy of reaction, G o for the cell reaction above 19. What is the value of the standard Gibbs Free Energy of reaction, Gs for the cell b) &Goran;= 230 kinnol c) Gorm- 10.4 kJ/molExplanation / Answer
18. E = E0 - (RT/nF)*Ln[Red]/[Ox]
E = 2.416V - (8.314J/molK*298K/3e*964000c/V)Ln(2.6e-3M/7.1e-1)
E=2.4649
19. deltaG0 = -FE0
deltaG0 = -232.90 kj/mol
There might be changes in the values but they are because of the truncation of the calculator. Notheless proccedure is shown.
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