out of methane ethane propane and butane the enthalpy of combustion will be maximum for
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Explanation:
The enthalpy of a reaction is calculated by taking the bond strengths of the bonds made from that of the bonds broken.
Each successive member of a homologous series differs by a CH₂. This means that to completely combust each successive member, you have to break an extra:
2 C–H bonds
C–C bond
1.5 O=O bonds
Then you make an extra:
2 C=O bonds
2 O–H bonds
As the bonds made are stronger than those broken, energy is released in this reaction, proving that long-chain alkanes release more energy than short-chain ones. Hence butane releases the most heat when burned
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