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Chemistry in Automobiles: Foran intern...

Chemistry in Automobiles:
Foran internal combustion engine to move a vehicled own the road, it must convert the energy stored in the fuel into mechanical energy to Ans. drive the wheels. In your car, the distributor and battery provide this starting energy by creating an electrical ''spark'', which helps in combustion of fuels like gasoline. Below is the reaction depicting complete combustion of gasoline in full supply of air:
`2C_(8)H_(18)(l)+25O_(2)(g)rarr16'X' +18'Y`
'Although nitrogen is the most abundant gas in the atmosphere, it does not take part in combustion'. Identify the correct reason for this statement.

A

Nitrogen is a reactive gas

B

Nitrogen is an inert gas

C

Nitrogen is an explosive gas

D

Only hydrocarbons can take part in combustion

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question regarding why nitrogen does not participate in combustion, we will break down the explanation into clear steps. ### Step-by-Step Solution: 1. **Understanding Combustion**: - Combustion is a chemical reaction that occurs when a substance reacts with oxygen, producing heat and light. For example, when hydrocarbons like gasoline combust, they react with oxygen to produce carbon dioxide and water. 2. **Role of Nitrogen in the Atmosphere**: - Nitrogen is the most abundant gas in the atmosphere, making up about 78% of the air we breathe. However, it does not participate in combustion reactions. 3. **Chemical Stability of Nitrogen**: - Nitrogen exists as a diatomic molecule (N₂) in the atmosphere. The nitrogen atoms in N₂ are held together by a strong triple bond (three covalent bonds). This bond is very stable and requires a significant amount of energy to break. 4. **Bond Order of Nitrogen**: - The bond order of nitrogen is 3, which means that there are three shared pairs of electrons between the nitrogen atoms. This high bond order contributes to the stability of the nitrogen molecule, making it inert under normal conditions. 5. **Comparison with Oxygen**: - In contrast, oxygen (O₂) has a bond order of 2, which means it is easier to break the O=O bond during combustion. This allows oxygen to readily react with fuels, facilitating combustion. 6. **Conclusion**: - Due to the strong triple bond in nitrogen molecules and the high bond order, nitrogen does not readily react with other substances, including during combustion processes. This is why nitrogen is considered inert in combustion reactions. ### Final Answer: Nitrogen does not participate in combustion because it exists as a stable diatomic molecule (N₂) with a strong triple bond between the nitrogen atoms, making it inert and difficult to break under normal combustion conditions. ---
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