Consider the phase transformation process . The value of for this process at 1 bar pressure and a temperature of 298 K has a value of 2.900 kJ/mol, and the value of for the process under these same pressure and temperature conditions has a value of J/K⋅mol. If the temperature increased from 298 K to K, but the pressure remained constant at 1 bar, would the thermodynamic stability of graphite relative to diamond increase, decrease or stay the same?
In addition to its two solid phases, diamond and graphite, elemental carbon has one liquid phase and one gas phase. The phase diagram for carbon is shown.
Which of the following phase transitions corresponds to the melting of graphite?
Which of the following phase transitions is not possible?
If the temperature decreases from 5 000 K to 3 000 K at a constant pressure of Pa, which phase transition takes place?
If the pressure increases from 10 bar to 10 kbar at a constant temperature of 4 000 K, which phase transition takes place?