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////Variable Declaration
dGf298 = 370.7 //Std. free energy of formation for Fe (g), kJ/mol
dHf298 = 416.3 //Std. Enthalpy of formation for Fe (g), kJ/mol
T0 = 298.15 //Temperature in K
T = 400. //Temperature in K
R = 8.314
//Calculations
dGf = T*(dGf298*1e3/T0 + dHf298*1e3*(1./T - 1./T0))
//Results
printf("\n Std. free energy of formation for Fe(g at 400 K is %4.1f kJ/mol",dGf/1000)
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