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Nov_28_30

# Nov_28_30 - Electrical Work Electrical work is done by...

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Electrical Work Electrical work is done by moving charges( q ) through a potential difference E w elec = q E Potential is measured in volts (V) Charge is measured in coulombs (C) 1 V = 1 J/C work w.r.t. system = - q E 1 mole of electrons = 96485 C = 1 Faraday (F) w elec = - n F E cell

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Electrical Work and G Including electrical work at constant T and P E = q p + w PV + w elec H= E + P V = q p - P V + w elec + P V = q p + w elec G = H – T S = q p + w elec – T S If the process is reversible (most efficient) q p = q p,rev = T S G = w elec
Electrical Work and Free Energy Recalling: w elec,max = G w elec = - n F E cell So, G = - n F E cell or G ° = - n F E ° cell

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Equilibrium The relationship between ΔG° and E° gives us another way to measure equilibrium constants G ° = - RT ln K eq G ° = - n F E ° cell So E ˚ cell = RT n F ln K eq
Example (2 x) Fe 3+ (aq) + e - (aq) Fe 2+ (aq) E° = 0.771 V (-1 x) I 2 (s) + 2 e - (aq) → 2 I - (aq) E° = 0.535 V 2 Fe 3+ (aq) + 2 I - (aq) → 2 Fe 2+ (aq) + I 2 (s) E° = 0.236 V

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Nov_28_30 - Electrical Work Electrical work is done by...

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