can you tell the scientific formula of coal or something scientific at least PLEASE(Norse:takk} or thank you?

Answer 1

Coal is not actually a compound, but rather a mixture of compounds and so it does not have a chemical formula.

However depending on the type of coal, it is composed of between 50-100% carbon, by mass, with the rest being Hydrogen, Nitrogen, Oxygen, and trace amounts of Sulfur.
Lignate has the lowest carbon content followed by sub-bituminous coal, bituminous coal, and finally anthracite which is almost pure carbon.

Answer 2

Coal is basically carbon but is formed from plant material millions of years old. The energy value of coal, or the fuel content, is the amount of potential energy in coal that can be converted into actual heating ability. The value can be calculated and compared with different grades of coal or even other materials. Materials of different grades will produce differing amounts of heat for a given mass.

While chemistry provides methods of calculating the heating value of a certain amount of a substance, there is a difference between this theoretical value and its application to real coal. The grade of a sample of coal does not precisely define its chemical composition, so calculating the actual usefulness of coal as a fuel requires determining its proximate and ultimate analysis (see "Chemical Composition" below).


Purity
Coal consists primarily of carbon, but this is usually mixed with various impurities, including water and mineral matter such as sand and clay. The relative amounts of these impurities affects the usefulness of the coal as a fuel. The quality of coal can be determined by its rank and grade. Coal purity is ranked in an ascending order of carbon content: Lignite → sub-bituminous coal → bituminous coal → anthracite.

Chemical composition
Chemical composition of the coal is defined in terms of its proximate and ultimate (elemental) analyses. The parameters of proximate analysis are moisture, volatile matter, ash, and fixed carbon. Elemental or ultimate analysis encompasses the quantitative determination of carbon, hydrogen, nitrogen, sulfur and oxygen within the coal. Additionally, specific physical and mechanical properties of coal and particular carbonization properties are also determined.

The calorific value Q of coal is the heat liberated by its complete combustion with oxygen. Q is a complex function of the elemental composition of the coal. Q can be determined experimentally using calorimeters. Dulong suggests the following approximate formula for Q when the oxygen content is less than 10%:

Q = 337C + 1442(H - O/8) + 93S,
where C is the mass percent of carbon, H is the mass percent of hydrogen, O is the mass percent of oxygen, and S is the mass percent of sulfur in the coal. With these constants, Q is given in kilojoules per kilogram.


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