Two forms of carbon are graphite, the soft, black slippery material used in “lead” pencials and as a lubricant for locks, and diamond, the brilliant, hard gemstone. Using the enthalpies of combustion for graphite (-394 kJ / mol;) and graphite (-396 kJ/mol), calcualte ?H for the conversion of graphite to diamond:

Cgraphits (s) ® Cdiamond(s)

Is the process exothermic or endothermic?

Answer rating: 100% (QA)

H H product H reactant 3... View the full answer