1. Note: If 1 liter of pure ethanol (density 0.79 g/mL) is used directly as a fuel of heat engines, only about 20% of the chemical energy stored in ethanol can be converted to useful mechanical work. This will generate 4392 kJ of energy (per liter) by assuming the enthalpy of combustion is 1277 kJ/mol for ethanol. On the other hand, 1 liter of ethanol can be converted to 92.85 mole of H2 (assuming 90% H2 selectivity in SRE) and will produce 12829 kJ energy (assuming 60% the fuel cell efficiency).
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