Question

The enthalpy change for the process $C\left(graphite\right)\to C\left(g\right)$ is called

• A. heat of vaporisation
• B. heat of sublimation
• C. heat of allotropic change
• D. heat of atomisation

Answer 1

Answer: (B), (C)

heat of sublimation
heat of allotropic change

Sublimation is the process of changing a solid into a gas without passing through the liquid phase.

So this process is the heat of sublimation.

$C\left(graphite\right)\to C\left(g\right)$

but here also an allotropic form of C changes so this is also the heat of allotropic change.