U.S. Energy Information Administration - EIA - Independent Statistics and Analysis
Frequently Asked Questions
Why do carbon dioxide emissions weigh more than the original fuel?
Carbon dioxide emissions weigh more than the original fuel because during complete combustion, each carbon atom in the fuel combines with two oxygen atoms in the air to make carbon dioxide (CO2 ). The addition of two oxygen atoms to each carbon atom forms CO2 , which has an atomic weight of 44 — roughly 3.6667 times the atomic weight of the carbon (12).
For example, subbituminous coal is on average 51% carbon, so the carbon in a short ton (2,000 pounds) weighs 1,020 pounds. The carbon dioxide emissions from burning a short ton of subbituminous coal are approximately 3,740 pounds, or about 3.67 times the weight of the carbon in a short ton of coal, and 1.87 times the weight of a short ton of coal.
The periodic table of elements shows the atomic weights of all elements.
Last reviewed: May 21, 2013
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