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//Variable Declaration
dGfCG = 0.0 //Std. Gibbs energy of formation for CaCO3 (s), kJ/mol
dGfCD = 2.90 //Std. Gibbs energy of formation for CaO (s), kJ/mol
rhoG = 2.25e3 //Density of Graphite, kg/m3
rhoD = 3.52e3 //Density of dimond, kg/m3
T0 = 298.15 //Std. Temperature, K
R = 8.314 //Ideal gas constant, J/(mol.K)
P0 = 1.0 //Pressure, bar
M = 12.01 //Molceular wt of Carbon
//Calculations
P = P0*1e5 + dGfCD*1e3/((1./rhoG-1./rhoD)*M*1e-3)
//Results
printf("\n Pressure at which graphite and dimond will be in equilibrium is %4.2e bar",P/1e5)
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