The hydrocarbons that are in liquid and gaseous form have low molar masses when compared to the solids . Solid form of aromatic hydrocarbon with high molar mass is Coal, which serves as a fossil fuel.
Fossil fuels are the fuels that are also called as non renewable sources of energy. Non renewable sources of energy get depleted over a period of usage.
Renewable sources are the sources like the solar energy, wind energy and the likes.
