The so-called hydrogen economy is based on hydrogen

Problem 95AP

The so-called hydrogen economy is based on hydrogen produced from water using solar energy. The gas is then burned as a fuel: A primary advantage of hydrogen as a fuel is that it is non polluting. A major disadvantage is that it is a gas and therefore is harder to store than liquids or solids. Calculate the number of moles of H2 required to produce an amount of energy equivalent to that produced by the combustion of a gallon of octane (C8H18). The density of octane is 2.66 kg/gal. and its standard enthalpy of formation is —249.9 kJ/mol.

                                                               Step by Step Solution

Step 1 of 3

Let’s calculate the energy produced by the one mole of octane.

The combustion reaction of octane is as follows.

Let’s convert the energy from kJ/mol to kJ/gallon.

Therefore, energy produced by the one mole of octane is  .