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diff --git a/172/CH4/EX4.3/ex3.sce b/172/CH4/EX4.3/ex3.sce
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+//example 3
+//work produced
+clear
+clc
+Psat=190.2 //in kPa
+P1=Psat //saturation pressure in state 1
+vf=0.001504 //in m^3/kg
+vfg=0.62184 //in m^3/kg
+x1=0.25 //quality
+v1=vf+x1*vfg //specific volume at state 1 in m^3/kg
+v2=1.41*v1 //specific volume at state 2 in m^3/kg
+P2=600 //pressure in state 2 in kPa
+m=0.5 //mass of ammonia in kg
+W=m*(P1+P2)*(v2-v1)/2 //woork produced by ammonia in kJ
+disp('hence,work produced by ammonia is 12.71 kJ')
+\ No newline at end of file