The extent of reaction generally depends on pressure as well as temperature. For the reaction (or phase transition) 

the standard-state Gibbs energy change at 25°C is 2866 J/mol. The density of graphite is 2.25 g/cc and that of diamond is approximately 3.51 g/cc; both solids may be considered to be incompressible. To help chemical engineering students pay their tuition, we are thinking of setting up equipment to run this reaction in the senior laboratory. Estimate what pressure, at room temperature (T ∼ 25°C), must be used to convert old pencil “leads” (graphite) into diamonds. 

Transcribed Image Text:

C(graphite) C(diamond) =