G ° and E ° can be said to measure the same thing, and are convertible by the eq
ID: 954718 • Letter: G
Question
G° and E° can be said to measure the same thing, and are convertible by the equation
G° = nF
Ecell
where n is the total number of moles of electrons being transferred, and F is the Faraday constant 9.64853415104 C/mol. The free energy (G°) 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.
The cathode is Ti(III) and the anode is Al.
The cell potential is 0.292 V.
The only reason I don't understand this is because how do I determine the number of moles, n in the equation when there is no balanced equation?
Explanation / Answer
n = number of electrons transferred in balanced equation
Here Ti+3 + 3 e- > Ti at cathode reduction takes place
Al > Al - 3 e- at anode oxidation takes place
here :
G° = nF
Ecell
= -3* 9.64853415 *.292 = 8.452 J
Faraday constant 9.64853415104 C/mol.
since delta G is -ve so reaction is spontaneous
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