Chapter 9, Problem 9.56PAE

9.54 The phase change between graphite and diamond is difficult to observe directly. Both substances can be hurned, however. From these equations, calculate $\Delta \text{H}°$ for the conversion of diamond into graphite.

   $\text{C}\left(\text{s},\text{graphite}\right)+{\text{O}}_{\text{2}}\left(\text{g}\right)\to {\text{CO}}_{\text{2}}\left(\text{g}\right)$

   $\Delta \text{H}°$= -393.51 kJ

   $\text{C}\left(\text{s},\text{diamond}\right)+{\text{O}}_{\text{2}}\left(\text{g}\right)\to {\text{CO}}_{\text{2}}\left(\text{g}\right)$

   $\Delta \text{H}°$= -395.94 kJ