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diff --git a/1709/CH7/EX7.7/7_7.sce b/1709/CH7/EX7.7/7_7.sce
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+clc
+//Initialization of variables
+disp("Critical tables suggest,")
+Tc=344 //R
+Pc=673 //psia
+P1=20 //psia
+P2=500 //psia
+M=16
+T=560 //R
+//calculations
+pr1=P1/Pc
+pr2=P2/Pc
+Tr=T/Tc
+dh2=0.65*Tc
+dsp=0.35 //B/lbm mol R
+dsp2=0.018-dsp- 1545/778 *log(P2/P1)
+W=dh2-dsp2*T
+W2=W/M
+//results
+printf("Work per pound mass = %d B/lbm",W2)
+//The answer is a bit different due to rounding off error