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diff --git a/858/CH2/EX2.19/example_19.sce b/858/CH2/EX2.19/example_19.sce
new file mode 100755
index 000000000..74672fa19
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+++ b/858/CH2/EX2.19/example_19.sce
@@ -0,0 +1,24 @@
+clc
+clear 
+printf("example 2.19 page number 78\n\n")
+
+//to find the molecular formula
+C=64.6     //% of carbon
+H2=5.2     //% of hydrogen
+O2=12.6    //% of oxygen
+N2=8.8     //% of nitrogen
+Fe=8.8     //% of iron
+
+a=C/12;    //number of carbon molecules
+c=8.8/14;   //number of nitrogen molecules
+b=H2/2;    //number of hydrogen molecules
+d=O2/16;   //number of oxygen molecules
+e=Fe/56    //number of iron atoms
+
+cm=243.4/(8.31*293)     //concentration
+
+ molar_mass=63.3/cm;
+ 
+ printf("a = %f, b = %f, c = %f, d = %f, e = %f",a*6.5,b*6.5,c*6.5,d*6.5,e*6.5)
+printf("\n\nformula of butyric acid is = C34H33N4O5Fe")
+