In the Pidgeon's process for the manufacture of magnesium. calcined dolomite is reduced with ferrosilicon according to the equation: 2MgOCaO(s)+Si(s)=2Mg(g)+2CaOSiO2(s) Given that: 1. 2MgO(s)+Si(s)=2Mg(g)+SiO2(s) G1=152.600+11.37TlogT99.18Tcal. 2. 2CaO(s)+SiO2(s)=2CaOSiO2(s) G2=30,2001.2Tcal. Evaluate the partial pressure of magnesium vapor at 1200C and discuss the feasibility of the process. In Pidgeon process. reduction is carried out at 1200C under a vacuum of the order of 104 atm. PMg=104atm. in 2CaOSiO2aSiO2=0.0001 and in 2MgOCaO. aMgO=1 aSi=1