$$\begin{gathered} {\mathrm{C}}_{\mathrm{diamond}}+ {\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{ }{\to } {\mathrm{CO}}_2\left(\mathrm{g}\right); ∆\mathrm{H}=-395 \mathrm{kJ} ....\left(\mathrm{i}\right) \\ {\mathrm{C}}_{\mathrm{graphite}}+ {\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{ }{\to } {\mathrm{CO}}_2\left(\mathrm{g}\right); ∆\mathrm{H}=-393.5 \mathrm{kJ} ....\left(\mathrm{ii}\right) \end{gathered}$$

The $∆\mathrm{H},$ when diamond is formed from graphite, is

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