If kJ mol

kJ mol

kJ mol

At constant temperature. Then:

Question

If  kJ mol

kJ mol

At constant temperature. Then:

Canvas Classes · Accepted Answer

Strategy:
 Use Hess's Law to relate the enthalpy of the phase transition (diamond to graphite) to the enthalpies of combustion for each allotrope.

Step 1: Compare combustion paths
1.   ()
2.  ()

Step 2: Derive the transition reaction

Target .
.
Comparing with  (where  is heat evolved, so ):
.

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