Question

name four varieties of coal with their carbon contact​

Answer 1

• Anthracite contains 86%–97% carbon and generally has the highest heating value of all ranks of coal. 
• Bituminous coal contains 45%–86% carbon.
• Subbituminous coal typically contains 35%–45% carbon, and it has a lower heating value than bituminous coal.
• Lignite contains 25%–35% carbon and has the lowest energy content of all coal ranks.

Answer 2

Answer:

Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter.

Bituminous: coal is a middle rank coal between subbituminous and anthracite. Bituminous usually has a high heating (Btu) value and is the most common type of coal used in electricity generation in the United States. Bituminous coal appears shiny and smooth when you first see it, but look closer and you may see it has layers.

Subbituminous: Subbituminous coal is black in color and dull (not shiny), and has a higher heating value than lignite.

Lignite: Lignite coal, aka brown coal, is the lowest grade coal with the least concentration of carbon.