initial commit / add all books

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diff --git a/599/CH7/EX7.5/example7_5.sce b/599/CH7/EX7.5/example7_5.sce
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+

+clear;

+clc;

+printf("\t Example 7.5\n");

+

+p1=.3;                   //percentage of the solute in the solution

+w1=1000;                 //weight of the solution taken

+w2=142;                 //molecular weight of Na2SO4.

+M1=(w2/(180+w2));        //solute (Na2SO4) present in the Na2CO3.10H2O solution

+s1=40.8;              //solubility of Na2SO4 at 30 degree per 100 gm of water

+s2=9.0;              //solubility of Na2SO4 at 10 degree per 100 gm of water

+//percent weight of solute in Na2SO4.10H2O= 144/322

+//let x be the weight of crystal formed 

+x=poly([0],'x');         //calc. x the weight of crystal

+t=roots((w1*40.8/140.8)-(.442*x+(w1-x)*(s2/(100+s2))));             

+printf("\n the weight of  crystal formed after crystallisation :%f kg",t);

+

+//end
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