G degree and E degree can be said to measure the same thing, and are convertible
ID: 904142 • Letter: G
Question
G degree and E degree can be said to measure the same thing, and are convertible by the equation G degree = -nFE degree cell where n is the total number of moles of electrons being transferred, and F is the Faraday constant 9.64853415xl0^4 C/mol. The free energy ( G degree ) of a spontaneous reaction is always negative. For each of the electrochemical cells below, calculate the free energy of the system and state whether the reaction is spontaneous or non-spontaneous as written based on the cathode and anode assignment given. (Use the table of Standard Electrode Potentials.) The cathode is Co(II) and the anode is Sn(II). free energy 6B3 kJ spontaneity The cathode is Ag(I) and the anode is Pb(II). free The cathodeis Zr(IV) and the anode is Cr(III). free energyExplanation / Answer
Cathode is the electrode where reduction occurs and anode is where oxidation occurs.
No, from the equation of standrd free energy, for a reaction to be spontaneous the standrd free energy should be negative or the standrd cell potential should be positive and vice versa.
a. E0cell = Ecathode - Eanode = -0.73- (-0.136) = -0.594 V
dG0rxn= -nFE0cell = -2*96485.3*(-0.594)= 114.63 kJ
As dG^0 is positive, the reaction is non-spontaneous.
b. E0cell = Ecathode - Eanode = -0.80- (-0.13) = -0.67 V
dG0rxn= -nFE0cell = -2*96485.3*(-0.67)= 129.289 kJ
As dG^0 is positive, the reaction is non-spontaneous.
c. E0cell = Ecathode - Eanode = -1.53- (-0.74) = -0.79 V
dG0rxn= -nFE0cell = -12*96485.3*(-0.79)= 914.67 kJ
As dG^0 is positive, the reaction is non-spontaneous.
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