After using the yum install command, you will be prompted for the computer's root password. Type in the root password and press 'Enter'. You will not see the password as you type. The terminal will start giving information about the application, and end with Is this ok [y/N]:.
While some of the compounds in the dirt and rock are the same in most coal, the carbon is combined here and there with hydrogen, oxygen, sulphur, nitrogen, phosporus and just about every other common element in small quantities. Imagine an extremely large net where the knots are carbon atoms.
The carbon content of coal ranges from 40% for low ranked coal (lignite) to about 98% for Anthracite Coal. Coal is not a mineral, because it can not be expressed as a chemical formula, and therefore, does not have a definate crystaline structure. Coal is predominately carbon.