Galvanic cells that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into electrical energy are called fuel cells.
H2—O2 fuel cell.
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How does fuel cell operate?
Answer:
In fuel cell, chemical energy of fuel is converted into electrical energy.
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Write the equation showing the relation between standard free energy and standard cell potential?
ANswer: The relation between satandard free energy and standard cell potential is given by ΔG° = – nFE°cell.
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Why is it impossible to obtain the electrode potential for a single half cell.
Answer:
This is because emf’s can only be measured for a completed circuit with two electrodes.