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April 18, 2014

Homework Help: chem

Posted by Andrew on Tuesday, November 2, 2010 at 5:27pm.

In a vehicle, H2 could be used in a fuel cell to generate energy.

Hydrogen is not an energy source, but a means of transporting energy because the extraction of H2 from the logical source, H2O, takes as much energy as is returned when the gas is used.

2 H2O (l) → 2 H2 (g) + O2 (g)

1. Without doing any calculations, which side will enthalpy favor in this reaction? Entropy?

2. What volume of water in gallons would need to be split to store the same amount of energy as found in 10.0 gallons of gasoline? (Gasoline contains 44.4 MJ/kg, or 32.0 MJ/L, and has a density of 0.72 g/mL where 1 L = 0.2641775 gal).

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