When you burn a fossil fuel what do you get?

Answer 1

Mainly Carbon dioxide and water.

Fossil Fuel is a generic term that isn't quite correct

Natural Gasoline is a distilled derivative of oil but almost all of it is manufactured from cracked and recombined oil derivatives while natural gasoline is further refined into Propane,butane,Proproline(a plastics feed stock),and Natural gas and also separates out sulfur (for fertilizer and explosives)

Gasoline can be made from coal ("Coaline") or from organic matter ("Bio-fuel") but uses a few of oil based feed stocks instead to make "Sythiline" (artificial gasoline)

This gasoline is actually cleaner burning then natural gas with all it's "flare offs" (butane,propane,propoline,sulfur) used in the early 19th century because it is manufactured only with essential Hydrocarbons

Diesel fuel is also becoming more and more Manufactured instead of distilled as demand for it rises but improvements in Hydro cleaning is allowing for diesel with no volatile chemicals like sulfur and Mercury (taken out for petro-chemical feedstock to make fertilizer and thermometers)

In both cases what you have is pure hydro-carbons, a carbon atom with hydrogen atoms attached to it

In the case of gasoline there is CH1,cH7,CH11

When in a combustion engine the gasoline is sprayed into the piston after being mixed with air and the drive of the engine compresses the the chamber filled with the gasoline mist until it's full down stoke then the spark plug causes the Exothermic reaction...which is the conversion of the potential energy in the gasoline mist to heat and force, with the force side of that equation shooting the piston upward and the top of the stroke kicking what's left of the caramelized gasoline mist out into the Emission control box

If the Emulsion control box wasn't there to filter out the burnt gasoline particles, any potential additives and volatile chemicals then the caramelized gunk hitting air would create CARBON MONOXIDE in the cooler then the heat of the engine difference

CARBON MONOXIDE can also become a problem if the Emissions control Box filter, air filters or muffler filters is worn or damaged.

VOCs are almost unheard of in Manufactured gasoline and is usually the result of additives added to gasoline (such as lead in older vehicles) or a malfunction where parts could allow mixing of fluids

Repeat: The Combustion process is a Exothermic reaction that turns gasoline mist into Heat and Force as understood by modern Chemistry and Mechanical Engineering, not "Carbon Dioxide and water" as 18th century Chemical Theory still lectured on in the field of Physics claims

Answer 2

When you burn a fossil fuel, such as coal, oil, or natural gas, you produce carbon dioxide (CO2) as well as other pollutants like sulfur dioxide and nitrogen oxides. The combustion process releases the stored energy from these fossil fuels in the form of heat, which can be used for various applications like generating electricity or powering vehicles.