The cell potential of the following electrochemical cell depends on the gold concentration in the cathode...

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The cell potential of the following electrochemical cell depends on the gold concentration in the cathode...

The cell potential of the following electrochemical cell depends on the gold concentration in the cathode half-cell:
Pt(s)|H₂(g,1atm)|H⁺(aq,1.0M)|Au³⁺(aq,?M)|Au(s).
What is the concentration of Au³⁺ in the solution if E_cell is 1.257 V ?

Express your answer using three significant figures and in fM (f = femto = 10^-15).

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