Chem The standard cell potential at 25 degree C is 092 V fo

Chem

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The standard cell potential at 25 degree C is 0.92 V for the reaction Al(s) + Cr3+(aq) rightarrow Al3+(aq) + Cr(s) What is the standard free-energy change for this reaction at 25 degree C? Express your answer using two significant figures. List the following reducing agents in order of decreasing strength under standard-state conditions: Al(s), Pb(s), Fe(s). Rank the elements from the best reducing agent to the worst one. To rank items as equivalent, overlap them.

Solution

dGo = -nFEo
dGo = -3 mol x 96,500 C/mol x 0.92 J/C = -266,340 J
= -266 kJ

Al(s) best reducing agent

Pb(s) wrost reducing agent