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diff --git a/858/CH7/EX7.3/example_3.sce b/858/CH7/EX7.3/example_3.sce
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+++ b/858/CH7/EX7.3/example_3.sce
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+clc
+clear
+printf("example 7.3 page number 305\n\n")
+
+//to find the change on rate of reaction
+//part 1
+//rate equation r = kC_NO^2*C_O2
+//if pressure increases 3 times
+
+r = 3^2*3;   //according to the rate reaction
+printf("reaction reate will be increased by with 3 times increase in pressure = %f times",r)
+
+//part 2
+r = 3^2*3;   //according to the rate reaction
+printf("\n\nreaction reate will be increased by with 3 times decrease in volume = %f times",r)
+
+r = 3^2;   //according to the rate reaction
+printf("\n\nreaction reate will be increased by with 3 times increase in conc of NO = %f times",r)