Chemistry
Pie Chart of Fossil Fuel Composition by Carbon Content
Last reviewed on 2026-05-22.
Chemistry — verifiable data, editable template
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The major fossil fuels differ in their carbon-to-hydrogen ratio. Coal is mostly carbon; natural gas (methane, CH₄) is the lowest-carbon fossil fuel by mass.
The data
- Coal (anthracite) — 92 % C by mass
- Crude oil — 84 % C by mass
- Natural gas — 75 % C by mass
Source
US EPA fuel composition reference.
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