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diff --git a/858/CH7/EX7.15/example_15.sce b/858/CH7/EX7.15/example_15.sce
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+clc
+//example 7.15
+//to find the rate equation
+t = [0;5;10;15;20;25]
+C_A = [25;18.2;13.2;9.6;7;5.1]
+
+//integral method of rate determination
+s = 0;
+for i = 2:6
+    k(i) = (1/t(i))*log(25/C_A(i))
+    //disp (k(i),"k values for various conc.")
+    s = s+k(i)
+end
+
+printf("average value of k = %f",s/5)
+disp ("ra =- 0.06367*CA","since its a first order reaction,")
+
+subplot(221) 
+plot(t,C_A)
+xlabel("time")
+ylabel("concentration")
+title("integral method")
+
+//differential method of rate determination
+ra = [-1.16;-0.83;-0.60;-0.43];
+C_A = [18.2;13.2;9.6;7];
+
+subplot(222) 
+plot(ra,C_A)
+xlabel("Concentration")
+ylabel("-ra")
+title("differential method")
+
+printf("\n\nrate from differential method = -0.064*CA")