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+clc
+//Initialization of variables
+h1=1220.4 //Btu/lbm
+s1=1.6050 //Btu/lbm R
+s2=1.6050 //Btu/lbm R
+p2=3 //psia
+sf=0.2008 //Btu/lbm R
+hf=109.37
+sfg=1.6855 //Btu/lbm R
+hfg=1013.2 //Btu/lbm
+eta=0.7
+//calculations
+x= (s2-sf)/sfg
+h2=hf+ x*hfg
+Wrev= h1-h2
+w=eta*Wrev
+//results
+printf("Work done = %d Btu/lbm",Wrev)
+printf("\n Work done in case 2 = %.1f Btu/lbm",w)
+//The asnwer is a bit different due to rounding off error int he textbook