Question

Describe the reaction that takes place when methane is burned in the presence of excess oxygen. Using the information on bond dissociation energy, prove that the reaction is exothermic. ii.Apart from heating and cooking purposes, alkanes can also be utilized as lubricating oils for engine. Using your knowledge of chemistry, explain your viewpoint on the properties of high molecular weight of alkanes in lubricating oils.

Answer 1

Answer:

Apart from heating and cooking purposes, alkanes can also be utilized as lubricating oils for engine. Using your ...

Answer 2

The combustion of methane gas releases 50.1 kJ/g.

Explanation:

• Hydrocarbon fuels like methane (CH₄) burn in the presence of oxygen to produce carbon dioxide and water.
• This process of combustion releases energy. When energy is released during the course of a chemical reaction, it is said to be an EXOTHERMIC reaction. The combustion of methane gas releases 50.1 kJ/g.

Lubricating oils are produced from the finishing (deasphalting, hydrotreatment, solvent extraction, and dewaxing) of heavy vacuum gas oils.

• ii. Lubricating oil (or simply lube oil) is largely used in automobiles, marine engines, and other machinery.
• Used or waste lube oil is a hazardous material, containing contaminants such as metals and polycyclic aromatic hydrocarbons produced by the engine during combustion processes.

1. Alkanes are important raw materials of the chemical industry and the principal constituent of gasoline and lubricating oils.
2. Natural gas mainly contains methane and ethane and is used for heating and cooking purposes and for power utilities (gas turbines).
3. For transportation purposes, natural gas may be liquefied by applying pressure and cooling it (LNG = liquid natural gas).