Question

Write chemical equations for combustion reaction of pentene.

Answer 1

Hint: Combustion reactions are defined as the reaction in which the chemical substance reacts with oxygen and forms carbon dioxide and water and releases the energy. It must involve $O_2$ as one of the reactants.

Complete answer:
The reaction in which a chemical substance or hydrocarbons react with oxygen and produce carbon dioxide and water and release the energy in form of light and heat is known as combustion reaction.
The burning of wood or coal in winter at home is an example of combustion reactions.
Production of energy in thermal power plants and the burning of petrol and diesel in cars are also the example of combustion reactions.
A general combustion reaction is represented as follows:
${\text{C}}_{\text{n}}{\text{H}}_{\text{2n}}\text{ + }{\text{O}}_{\text{2}}\stackrel{\mathrm{\Delta }}{\to }n\text{C}{\text{O}}_2+n{\text{H}}_{2}O$
Where,
${\text{C}}_{\text{n}}{\text{H}}_{\text{2n}}$is a hydrocarbon. The general formula for hydrocarbon is ${\text{C}}_{\text{n}}{\text{H}}_{\text{2n}}$. Where n is the number of carbons atoms.
In pentene, the number of carbon atoms is five. So, the chemical formula of pentene is,
${\text{C}}_5{\text{H}}_{\text{2}\times \text{5}}$
${\text{C}}_5{\text{H}}_{10}$
So, the chemical formula of pentene is ${\text{C}}_5{\text{H}}_{10}$.
The equation for the combustion of pentene is represented as follows:
${\text{C}}_5{\text{H}}_{10}\text{ + }{\displaystyle \frac{15}{2}}{\text{O}}_{\text{2}}\stackrel{\mathrm{\Delta }}{\to }5\text{C}{\text{O}}_2+5{\text{H}}_{2}O$
So, the combustion of one mole of pentene produces five moles of carbon dioxide and five moles of water.
Therefore, the chemical equations for the combustion reaction of pentene is,${\text{C}}_5{\text{H}}_{10}\text{ + }{\displaystyle \frac{15}{2}}{\text{O}}_{\text{2}}\stackrel{\mathrm{\Delta }}{\to }5\text{C}{\text{O}}_2+5{\text{H}}_{2}O$ .

Note: Combustion reactions can simply be understood as the burning of hydrocarbons. Combustion reactions require high temperatures. The combustion reaction produces released energy, so these are exothermic reactions. Products of combustion reactions are gases. The number of carbon atoms represents the mole of products produced by one mole of hydrocarbon.