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The efficiency of a fuel cell is given b...

The efficiency of a fuel cell is given by:

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`eta=(DeltaG)/(DeltaH) `
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A fuel cell is a cell that is continously supplied with an oxidant and a reductant so that if can deliver a current indefinitely. Fuel cells offer the possibility of achieving high thermodynamic efficiency in the conversion of Gibbs energy into mechanical work.Internal combustion engines at best convert only the fraction (T_2-T_1)//T_2 of the heat of combustion into mechanical work. While the thermodynamic efficiency of the fuel cell is given by, eta=(DeltaG)/(DeltaH) , where DeltaG is the Gibbs energy change for the cell reaction and DeltaH is the enthalpy change of the cell reaction.A hydrogen-oxygen fuel cell may have an acidic or alkaline electrolyte. Pt|H_2(g)|H^(+)(aq.)||H_2O(l)|O_(2)(g)|Pt , (2.303 RT)/F=0.06 The above fuel cell is used to produce constant current supply under constant temperature & 30 atm constant total pressure conditions in a cylinder.If 10 moles H_2 and 5 moles of O_2 were taken initially. Rate of consumption of O_2 is 10 milli moles per minute. The half-cell reactions are 1/2O_2(g)+2H^+(aq)+2e^(-)toH_2O(l) E^(@)=1.246 V 2H^+(aq)+2e^(-) to H_2(g) E^(@)=0 To maximize the power per unit mass of an electrochemical cell, the electronic and electrolytic resistances of the cell must be minimized.Since fused salts have lower electolytic resistances than aqueous solutions, high-temperature electrochemical cells are of special interest for practical applications. Calculate e.m.f of the given cell at t=0.(log 2=0.3)

Thermodynamic efficiency of a cell is given by:

The thermodynamic efficiency of cell is given by

The thermodynamic efficiency of cell is given by

The efficiency of a fuel cell si 80% and the standard heat of reaction is -300kJ . The reaction involves two electrons in redox change. E^(c-) for the cell is

Theoretical efficiency of fuel is

PRADEEP-ELECTROCHEMISTRY-TEST YOUR GRIP (FILL IN THE BLANKS)
  1. If every quantity is expressed in SI units, then molar conductivity (w...

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  2. Conductivity (kappa), conductance (G) and cell constant (G^(@)) are re...

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  3. The units of cell constant are ......

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  4. Out of specific, equivalent and molar conductivities, the quantity whi...

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  5. According to Debye-Huckel-Onsager equation,wedge(m)^(c)=.

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  6. According to Kohlrausch'a law, wedge(m)^(@) for electrolyte A(x)B(y)=.

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  7. Ionic mobility=("Ionic conductance")/("")

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  8. In a galvanic cell, the electrode which acts as anode is a pole.

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  9. In a galvanic cell, the electrons flow from :

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  10. KCl, KNO(3) etc. are preferred in a salt bridge because they have equa...

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  11. CALOMEL ELECTRODE

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  12. Out of Fe,Cu,Sn and Hg, the most reactive metal is and least reactive...

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  13. If E(Red)^(@) for Ag^(+)+e^(-)toAg is 0.80 V, then for the reaction 2A...

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  14. Nernst equation halps us to understand the effect of "" on the electr...

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  15. In the electrolysis of aqueous NaCl solution, Cl(2) is produced at the...

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  16. In Leclanche cell, MnO(2) acts as a.

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  17. In lead storage battery, the cathode consists of.

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  18. The efficiency of a fuel cell is given by:

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  19. The process of protecting iron by coating with Zinc.

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  20. The energy of one joule per second given out by a source is called.

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