Enthalpy of allotropic modification or allotropic transformation is exothermic or endothermic??
Dear student,
The Enthalpy of allotropic modification or allotropic transformation is endothermic in nature. the energy is absorbed and used for breaking the bonds of one allotrope to change into another.
Example-
To form a diamond, the hexagonal rings in graphite first have to undergo structural changes ( physical). When this happens, the graphite forms into a metastable allotrope of carbon called a hexagonal diamond. Carbon prefers to form into a different hexagonal structure. So, during the reaction, energy is absorbed to deform the graphite allotrope.
Regards.
The Enthalpy of allotropic modification or allotropic transformation is endothermic in nature. the energy is absorbed and used for breaking the bonds of one allotrope to change into another.
Example-
To form a diamond, the hexagonal rings in graphite first have to undergo structural changes ( physical). When this happens, the graphite forms into a metastable allotrope of carbon called a hexagonal diamond. Carbon prefers to form into a different hexagonal structure. So, during the reaction, energy is absorbed to deform the graphite allotrope.
Regards.