Delta G vs. G standard at Equilibrium

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Dr Gerrard

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In a galvanic cell, which of the following is true of a tin/copper cell reaction?

K > 1 and standard g > 0
K > 1 and standard g < 0
K < 1 and standard g > 0
K < 1 and standard g < 0


The only way to know this problem is to assume that delta G = 0, so you can set standard g = -RTlnK.

The solution says that a galvanic cell generates power via a spontaneous reaction, so standard G must be less than 0.

What is the relationship between standard G and G at equilibrium?

standard g = -RTlnK

Does this equation always hold true, no matter what?

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