Calculate the enthalpy change for the transition, graphite `iff` diamond from the `Delta H _("comb") ^(@)` values of `-393.5kJ mol^(-1) and -395.4 kJ mol^(-1)` for graphite and diamond, respectively.

Explanation

C (s, graphite) `+ O _(2)(g) to CO _(2) (g) , =-393.5 kJ mol ^(-1) " "...(1)`
C (s, diamond) `+ O _(2) (g) to CO _(2) (g), Delta H _("comb") ^(@) =- 395.4 kJmol ^(-1) " "...(ii)`
Subtracting equation (ii) from equation (i)
C (s, graphite) `to C` (s,diamond),` Delta H _(it) ^(@) = + 1.9 kJ mol ^(-1)`