An electrochemical cell is fueled by the combustion of butane at 1 bar and 298 K . Its cell potential is X F 10^3 volts, where F is the Faraday constant. The value of X is . Use : Standard Gibbs energies of formation at 298 K are : _f G_ CO _2 ^ =-394 ~kJ ~mol ^ -1 ; _f G_ water ^ =-237 ~kJ ~mol ^ -

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An electrochemical cell is fueled by the combustion of butane at 1 bar and 298 K . Its cell potential is X F 10^3 volts, where F is the Faraday constant. The value of X is . Use : Standard Gibbs energies of formation at 298 K are : _f G_ CO _2 ^ =-394 ~kJ ~mol ^ -1 ; _f G_ water ^ =-237 ~kJ ~mol ^ -1 ; _f G_ butane ^ =-18 ~kJ ~mol ^ -1

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Correct answer: A. A

aligned & C _4 H _ 10 ( ~g )+ 13 2 O _2( ~g ) 4 CO _2( ~g )+5 H _2 O (l) \ & _ r G ^ =4 _ f G _ CO _2 ^ +5 _ f G _ H _2 O ^ - _ f G _ C _4 H _ 10 ^ \ & =4 (-394)+5(-237)+18 \ & =-2743 ~kJ / mol \ & _ r G ^ =- nFE ^ \ & -2743 1000=-26 FE ^ \ & E ^ = 105.5 ~F 10^3=105.50 aligned

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