Explain hydrocarbons as feed stock in industry;

Feedstock are raw materials that are fed into a process for conversion into different products.

Hydrocarbon based substances that  are used as feed stock in industry include  butadiene, benzene, toluene, xylene and naphthalene.  

Ethane, propane, butane, naphthas, kerosene and heavy atmospheric and vacuum oils are hydrocarbon feeds employed in cracking furnaces for the production of ethylene, propylene and other cracked gas products in the presence of steam. 

Natural gas and oil are feed stock in the production of ammonia, used to make fertilizer.. Natural gas is the preferred feed stock for ammonia production because  it is intrinsically the most hydrogen rich raw material.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume