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diff --git a/3689/CH1/EX1.2/1_2.sce b/3689/CH1/EX1.2/1_2.sce
new file mode 100644
index 000000000..86f952a9a
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+////Variable Declaration
+phe = 1.5          //Pressure in Helium chamber, bar
+vhe = 2.0          //Volume of Helium chamber, L
+pne = 2.5          //Pressure in Neon chamber, bar
+vne = 3.0          //Volume of Neon chamber, L
+pxe = 1.0          //Pressure in Xenon chamber, bar
+vxe = 1.0          //Volume of Xenon chamber, L
+R = 8.314e-2       //Ideal Gas Constant, L.bar/(mol.K)
+T = 298            //Temperature of Gas, K
+//Calculations
+
+nhe = phe*vhe/(R*T)            //Number of moles of Helium, mol
+nne = pne*vne/(R*T)            //Number of moles of Neon, mol
+nxe = pxe*vxe/(R*T)            //Number of moles of Xenon, mol
+n = nhe + nne + nxe            //Total number of moles, mol
+V = vhe + vne + vxe            //Total volume of system, L
+xhe = nhe/n
+xne = nne/n
+xxe = nxe/n
+P = n*R*T/(V)
+phe = P*xhe              //Partial pressure of Helium, bar
+pne = P*xne              //Partial pressure of Neon, bar
+pxe = P*xxe              //Partial pressure of Xenon, bar
+
+//Results
+printf("\n Moles of He=%4.3f, Ne=%4.3f and, Xe=%4.3f in mol",nhe,nne,nxe )
+
+printf("\n Mole fraction of xHe=%4.3f, xNe=%4.3f and, xXe=%4.3f",xhe,xne,xxe)
+
+printf("\n Final pressure is %4.3f bar",P)
+
+printf("\n Partial pressure of pHe=%4.3f, pNe=%4.3f and, pXe=%4.3f in bar",phe,pne,pxe)
+