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////Variable Declaration
dGfFe = 0.0 //Std. Gibbs energy of formation for Fe (S), kJ/mol
dGfH2O = -237.1 //Std. Gibbs energy of formation for Water (g), kJ/mol
dGfFe2O3 = -1015.4 //Std. Gibbs energy of formation for Fe2O3 (s), kJ/mol
dGfH2 = 0.0 //Std. Gibbs energy of formation for Hydrogen (g), kJ/mol
T0 = 298.15 //Temperature in K
R = 8.314
[nFe,nH2,nFe2O3,nH2O] = (3,-4,-1,4)
//Calculations
dGR = nFe*dGfFe + nH2O*dGfH2O + nFe2O3*dGfFe2O3 + nH2*dGfH2
//Results
printf("\n Std. Gibbs energy change for reaction is %4.2f kJ/mol",dGR)
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