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diff --git a/2510/CH5/EX5.7/Ex5_7.sce b/2510/CH5/EX5.7/Ex5_7.sce
new file mode 100755
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+//Variable declaration:
+R = 10.73                       //Universal gas constant (psia . ft^3/lbmol .°R)
+T = 70+460                      //Temperature in Rankine scale (°R)
+v = 10.58                       //Specific volume (ft^3/lb)
+P = 14.7                        //Absolute pressure (psia)
+
+//Calculation:
+MW = R*T/v/P                    //Molecular weight of gas (lb/lbmol)
+
+//Result:
+printf("The molecular weight of the gas is : %.2f lb/lbmol.",MW)
+printf("It appears that the gas is HCl (i.e., hydrogen chloride).")