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What is the likelihood that hydrogen $\left(\mathrm{H}_{2}\right)$ will become a widely used fuel and that the "hydrogen economy" will become a reality? I...

Question

What is the likelihood that hydrogen $\left(\mathrm{H}_{2}\right)$ will become a widely used fuel and that the "hydrogen economy" will become a reality? In particular, what are the advantages and disadvantages of $\mathrm{H}_{2}$ as a fuel? What would be necessary for a significant conversion to a "hydrogen economy"?

What is the likelihood that hydrogen $\left(\mathrm{H}_{2}\right)$ will become a widely used fuel and that the "hydrogen economy" will become a reality? In particular, what are the advantages and disadvantages of $\mathrm{H}_{2}$ as a fuel? What would be necessary for a significant conversion to a "hydrogen economy"?



Answers

Hydrogen, a potential future fuel, can be produced from carbon (from coal) and steam by this reaction:
$$\mathrm{C}(s)+2 \mathrm{H}_{2} \mathrm{O}(g) \longrightarrow 2 \mathrm{H}_{2}(g)+\mathrm{CO}_{2}(g)$$
Use average bond energies to calculate $\Delta H_{\mathrm{rxn}}$ for the reaction.


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