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Coal is fundamentally “sedimentary rock that burns.” Formed  by the decomposition of plant matter, coal is a complex substance that is marketed in four classes – anthracite, bituminous, sub-bituminous and lignite. Elemental analysis gives empirical formulas such as C137H97O9NS for bituminous coal. For high-grade anthracite, the formula is likely C240H90O4NS.

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