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hydrogen-oxygen fuel cell may have an ac...

hydrogen-oxygen fuel cell may have an acidic or alkaline electrolyte. The half-cell reactions are

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 electrolytic resistances that aqueous solutions, high-temperature electrochemical cells are of special interest for practical applications.
High temperature also allow the use of liquid metal electrode, which make possible higher current densities than solid electrodes
If 560 mL of `H_2` gas at STP is fed into and is consumed by the fuel cell in 10 minutes, then what is the current output of the fuel cell?

A

4A

B

8A

C

16A

D

12A

Text Solution

Verified by Experts

The correct Answer is:
B
`1F to (1)/(2) ` mole of `H_2 , 96500 " coul" to (1)/(2) "mole of " H_2 "gas " `
`(C xx 10 xx 60)_("coul") to ((560))/((22400)) " mole of " H_2 , C xx 10 xx 60 xx (1)/(2) = 96500 xx (500)/(22400) , C = 8am`
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hydrogen-oxygen fuel cell may have an acidic or alkaline electrolyte. The half-cell reactions are 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 electrolytic resistances that aqueous solutions, high-temperature electrochemical cells are of special interest for practical applications. High temperature also allow the use of liquid metal electrode, which make possible higher current densities than solid electrodes How many grams of water is produced in the cell if 2 Faradays of charge is derived from the fuel cells

hydrogen-oxygen fuel cell may have an acidic or alkaline electrolyte. The half-cell reactions are 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 electrolytic resistances that aqueous solutions, high-temperature electrochemical cells are of special interest for practical applications. High temperature also allow the use of liquid metal electrode, which make possible higher current densities than solid electrodes For a Hydrogen-Oxygen fuel cell if DeltaH_(f)^(@)=(H_2O, l) = – 285 kJ //" mole" , then what will be its thermodynamic efficiency under standard conditions

Knowledge Check

  • In a electrochemical cell

    A
    Potential energy changes into kinetic energy
    B
    Kinetic energy changes into potential energy
    C
    Chemical energy changes into electrical energy
    D
    Electrical energy changes into chemical energy

  • In a electrochemical cell

    A
    Potential energy changes into kinetic energy
    B
    Kinetic energy changes into potential energy
    C
    Chemical energy changes into electrical energy
    D
    Electrical energy changes into chemical energy

  • In an electrochemical cell Delta G= Delta H

    A
    `T rarr 0`
    B
    `T rarr oo`
    C
    `((d E_("cell"))/(dT))_(P) = 0`
    D
    `dE_("cell")= 0`

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