
685Transportation
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of carbon dioxide in the atmosphere. Therefore, the CO
2
from the fermentation is
“carbon neutral,” that is, the amount of CO
2
released by the fermentation is bal-
anced by CO
2
removed from the atmosphere in making the corn sugar. [Note: The
same is true for the fermentation of any biomass.] Likewise, each atom of C in the
CO
2
produced by combustion of ethanol is also carbon neutral.
2. Calculate the total amount of CO
2
released to the atmosphere per MJ (LHV) of
ethanol made from corn and combusted, and the net amount of CO
2
released
per MJ (LHV) of ethanol made from corn and combusted. The ...