Which of the following reactions is most suitable for a fuel...

Which of the following reactions is most suitable for a fuel cell? a. $2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})$ b. $\mathrm{MnO}_{2}(\mathrm{~s})+\mathrm{Li}(\mathrm{s}) \rightarrow \mathrm{LiMnO}_{2}(\mathrm{~s})$ c. $\mathrm{HgO}(\mathrm{l})+\mathrm{Zn}(\mathrm{s}) \rightarrow \mathrm{ZnO}(\mathrm{s})+\mathrm{Hg}$ (l) d. $\mathrm{Pb}(\mathrm{s})+\mathrm{PbO}_{2}(\mathrm{~s})+2 \mathrm{H}^{+}(\mathrm{aq})+\mathrm{HSO}_{4}^{-}(\mathrm{aq}) \rightarrow$ $\mathrm{PbSO}_{4}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

Which of the following reactions is most suitable for a fuel cell?
a. $2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})$
b. $\mathrm{MnO}_{2}(\mathrm{~s})+\mathrm{Li}(\mathrm{s}) \rightarrow \mathrm{LiMnO}_{2}(\mathrm{~s})$
c. $\mathrm{HgO}(\mathrm{l})+\mathrm{Zn}(\mathrm{s}) \rightarrow \mathrm{ZnO}(\mathrm{s})+\mathrm{Hg}$ (l)
d. $\mathrm{Pb}(\mathrm{s})+\mathrm{PbO}_{2}(\mathrm{~s})+2 \mathrm{H}^{+}(\mathrm{aq})+\mathrm{HSO}_{4}^{-}(\mathrm{aq}) \rightarrow$
$\mathrm{PbSO}_{4}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

Key Concepts

Fuel Cell

A fuel cell is an electrochemical device that converts chemical energy into electrical energy through redox reactions. It is designed to operate continuously by supplying fresh fuel and oxidant, which allows for a steady production of electricity, making it suitable for applications where sustained power output is required.

Redox Reaction

Redox reactions involve the transfer of electrons between chemical species, occurring through simultaneous oxidation (loss of electrons) and reduction (gain of electrons). These reactions are fundamental to both fuel cells and batteries, as the electron flow generated during redox processes is harnessed to produce electrical energy.

Electrochemical Cell Design

Electrochemical cells, including both batteries and fuel cells, are constructed based on the principles of redox reactions. The design of a fuel cell emphasizes continuous reactant supply, effective separation of oxidation and reduction sites, and high efficiency in converting chemical energy to electrical energy.

Choice of Reactants

In the context of fuel cells, the selection of reactants is critical because it influences the efficiency and practicality of the cell. Reactants that are in gaseous or liquid form are often preferable as they can be continuously fed into the cell, enabling sustained operation unlike isolated reactions used in conventional batteries.

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