Asample of coal has the following analysis (wt %). moisture 1.1%, fixed carbon 74%, volatile matter 17.9%, carbon 63.7%, hydrogen 3.3%, nitrogen 1.7%, sulfur 1.7%, oxygen 10.9% and the rest is ash. determine the fixed carbon on a dry and mineral matter free basis.
b. determine the coal rank of the above analysis. its one of these
medium volatile
low volatile
semianthracite
anthracite

Coal is a traditionally used source of energy, there are main four types of ranks for coal. Here the rank of a coal means to a natural process called Coalification, which takes place during a plant is buried and changes to a harder, and denser material and become even more rich in carbon contents.

Anthracite is know to have the highest ranked coal, it contains highest percent of fixed carbon and lowest percent of volatile material.

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